¿Que son los tooltips? Un tooltip (tambien llamada descripcion emergente) es una herramienta de ayuda visual, que funciona al situar el cursor sobre algun elemento grafico, mostrando una ayuda adicional para informar al usuario de la finalidad del elemento sobre el que se encuentra. Pues en este caso, esta aplicado mediante CSS3 a estos tres iconos (Google+, Twitter y Facebook) para que les de un efecto circular al pasar el cursor sobre ellos. Ya puedes ponerlos en la sidebar de tu blog (o donde quieras) para que enlacen con tus redes sociales.EJEMPLO:
Para ponerlo en tu blog o web, tan solo tienes que copiar este codigo y añadirlo a un gadget HTML. Sustituye lo que esta escrito en color rojo por las urls de tus redes sociales.
<ul class="md2-wrapper">
<li><a target="_blank" class="md2-gplus" href="URL GOOGLE+"><span>Google+</span></a></li>
<li><a target="_blank"class="md2-twitter" href="URL TWITTER"><span>Twitter</span></a></li>
<li><a target="_blank"class="md2-facebook" href="URL FACEBOOK"><span>Facebook</span></a></li>
</ul>
<style type="text/css">.md-wrapper{padding:0;width:435px;height:70px;margin:80px auto 30px auto;}.md-wrapper li{float:center;}.md-wrapper ol,ul{list-style:none;}.md-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;position:relative;}.md-wrapper li .md-gplus{background-position:0px 0px;}.md-wrapper li .md-twitter{background-position:-68px 0px;}.md-wrapper li .md-facebook{background-position:-204px 0px;}.md-wrapper li a span{width:100px;height:auto;line-height:20px;padding:10px;left:50%;margin-left:-64px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:4px solid #fff;background:rgba(255,255,255,0.3);text-indent:0px;/*border-radius*/-webkit-border-radius:5px;-moz-border-radius:5px;border-radius:5px;position:absolute;pointer-events:none;bottom:100px;opacity:0;/*box-shadow*/-webkit-box-shadow:1px 1px 2px rgba(0,0,0,0.1);-moz-box-shadow:1px 1px 2px rgba(0,0,0,0.1);box-shadow:1px 1px 2px rgba(0,0,0,0.1);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;}.md-wrapper li a span:before,.md-wrapper li a span:after{content:'';position:absolute;bottom:-15px;left:50%;margin-left:-9px;width:0;height:0;border-left:10px solid transparent;border-right:10px solid transparent;border-top:10px solid rgba(0,0,0,0.1);}.md-wrapper li a span:after{bottom:-14px;margin-left:-10px;border-top:10px solid #fff;}.md-wrapper li a:hover span{opacity:0.9;bottom:70px;}.md2-wrapper{padding:0;width:230px;height:70px;margin:80px auto 30px auto;}.md2-wrapper li{float:left;}.md2-wrapper ol,ul{list-style:none;}.md2-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;position:relative;z-index:2;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;}.md2-wrapper li .tt-gplus{background-position:0px 0px;}.md2-wrapper li .md2-twitter{background-position:-68px 0px;}.md2-wrapper li .md2-facebook{background-position:-204px 0px;}.md2-wrapper li a span{width:80px;height:80px;line-height:80px;padding:10px;left:50%;margin-left:-55px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:5px solid #fff;background:rgba(255,255,255,0.5);text-indent:0px;position:absolute;pointer-events:none;/*border-radius*/-webkit-border-radius:50%;-moz-border-radius:50%;border-radius:50%;bottom:-40px;opacity:0;/*box-shadow*/-webkit-box-shadow:0px 3px 8px rgba(0,0,0,0.1);-moz-box-shadow:0px 3px 8px rgba(0,0,0,0.1);box-shadow:0px 3px 8px rgba(0,0,0,0.1);/*transform*/-webkit-transform:scale(0.2);-moz-transform:scale(0.2);-ms-transform:scale(0.2);-o-transform:scale(0.2);transform:scale(0.2);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;}.md2-wrapper li a:hover span{opacity:0.9;bottom:50px;/*transform*/-webkit-transform:scale(1);-moz-transform:scale(1);-ms-transform:scale(1);-o-transform:scale(1);transform:scale(1);}.md3-wrapper{padding:0;width:435px;height:70px;margin:80px auto 30px auto;}.md3-wrapper li{float:left;}.md3-wrapper ol,ul{list-style:none;}.md3-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;position:relative;z-index:2;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;}.md3-wrapper li .md3-gplus{background-position:0px 0px;}.md3-wrapper li .md3-twitter{background-position:-68px 0px;}.md3-wrapper li .md3-facebook{background-position:-204px 0px;}.md3-wrapper li a span{width:80px;height:auto;padding:10px;left:50%;margin-left:-55px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:5px solid #fff;background:rgba(255,255,255,0.5);text-indent:0px;position:absolute;pointer-events:none;bottom:-40px;opacity:0;/*box-shadow*/-webkit-box-shadow:0px 1px 2px rgba(0,0,0,0.1);-moz-box-shadow:0px 1px 2px rgba(0,0,0,0.1);box-shadow:0px 1px 2px rgba(0,0,0,0.1);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;/*transform*/-webkit-transform:rotate(0deg) scale(0);-moz-transform:rotate(0deg) scale(0);-ms-transform:rotate(0deg) scale(0);-o-transform:rotate(0deg) scale(0);transform:rotate(0deg) scale(0);}.md3-wrapper li a:hover span{opacity:0.9;bottom:100px;/*transform*/-webkit-transform:rotate(-90deg) scale(1);-moz-transform:rotate(-90deg) scale(1);-ms-transform:rotate(-90deg) scale(1);-o-transform:rotate(-90deg) scale(1);transform:rotate(-90deg) scale(1);}.md4-wrapper{padding:0;width:435px;height:70px;margin:80px auto 30px auto;}.md4-wrapper li{float:left;}.md-wrapper ol,ul{list-style:none;}.md4-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;position:relative;}.md4-wrapper li .md4-gplus{background-position:0px 0px;}.md4-wrapper li .md4-twitter{background-position:-68px 0px;}.md4-wrapper li .md4-facebook{background-position:-204px 0px;}.md4-wrapper li a span{width:100px;height:auto;line-height:20px;padding:10px;left:50%;margin-left:-64px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:4px solid #fff;background:rgba(255,255,255,0.3);text-indent:0px;/*border-radius*/-webkit-border-radius:5px;-moz-border-radius:5px;border-radius:5px;position:absolute;bottom:70px;opacity:0;visibility:visible;pointer-events:none;/*box-shadow*/-webkit-box-shadow:1px 1px 2px rgba(0,0,0,0.1);-moz-box-shadow:1px 1px 2px rgba(0,0,0,0.1);box-shadow:1px 1px 2px rgba(0,0,0,0.1);/*transform*/-webkit-transform:translate(35px) rotate(25deg) scale(1.5);-moz-transform:translate(35px) rotate(25deg) scale(1.5);-ms-transform:translate(35px) rotate(25deg) scale(1.5);-o-transform:translate(35px) rotate(25deg) scale(1.5);transform:translate(35px) rotate(25deg) scale(1.5);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;}.md4-wrapper li a span:before,.md4-wrapper li a span:after{content:'';position:absolute;bottom:-15px;left:50%;margin-left:-9px;width:0;height:0;border-left:10px solid transparent;border-right:10px solid transparent;border-top:10px solid rgba(0,0,0,0.1);}.md4-wrapper li a span:after{bottom:-14px;margin-left:-10px;border-top:10px solid #fff;}.md4-wrapper li a:hover span{visibility:visible;opacity:0.9;/*transform*/-webkit-transform:translate(0px) rotate(0deg) scale(1);-moz-transform:translate(0px) rotate(0deg) scale(1);-ms-transform:translate(0px) rotate(0deg) scale(1);-o-transform:translate(0px) rotate(0deg) scale(1);transform:translate(0px) rotate(0deg) scale(1);}</style>
<li><a target="_blank" class="md2-gplus" href="URL GOOGLE+"><span>Google+</span></a></li>
<li><a target="_blank"class="md2-twitter" href="URL TWITTER"><span>Twitter</span></a></li>
<li><a target="_blank"class="md2-facebook" href="URL FACEBOOK"><span>Facebook</span></a></li>
</ul>
<style type="text/css">.md-wrapper{padding:0;width:435px;height:70px;margin:80px auto 30px auto;}.md-wrapper li{float:center;}.md-wrapper ol,ul{list-style:none;}.md-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;position:relative;}.md-wrapper li .md-gplus{background-position:0px 0px;}.md-wrapper li .md-twitter{background-position:-68px 0px;}.md-wrapper li .md-facebook{background-position:-204px 0px;}.md-wrapper li a span{width:100px;height:auto;line-height:20px;padding:10px;left:50%;margin-left:-64px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:4px solid #fff;background:rgba(255,255,255,0.3);text-indent:0px;/*border-radius*/-webkit-border-radius:5px;-moz-border-radius:5px;border-radius:5px;position:absolute;pointer-events:none;bottom:100px;opacity:0;/*box-shadow*/-webkit-box-shadow:1px 1px 2px rgba(0,0,0,0.1);-moz-box-shadow:1px 1px 2px rgba(0,0,0,0.1);box-shadow:1px 1px 2px rgba(0,0,0,0.1);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;}.md-wrapper li a span:before,.md-wrapper li a span:after{content:'';position:absolute;bottom:-15px;left:50%;margin-left:-9px;width:0;height:0;border-left:10px solid transparent;border-right:10px solid transparent;border-top:10px solid rgba(0,0,0,0.1);}.md-wrapper li a span:after{bottom:-14px;margin-left:-10px;border-top:10px solid #fff;}.md-wrapper li a:hover span{opacity:0.9;bottom:70px;}.md2-wrapper{padding:0;width:230px;height:70px;margin:80px auto 30px auto;}.md2-wrapper li{float:left;}.md2-wrapper ol,ul{list-style:none;}.md2-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;position:relative;z-index:2;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;}.md2-wrapper li .tt-gplus{background-position:0px 0px;}.md2-wrapper li .md2-twitter{background-position:-68px 0px;}.md2-wrapper li .md2-facebook{background-position:-204px 0px;}.md2-wrapper li a span{width:80px;height:80px;line-height:80px;padding:10px;left:50%;margin-left:-55px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:5px solid #fff;background:rgba(255,255,255,0.5);text-indent:0px;position:absolute;pointer-events:none;/*border-radius*/-webkit-border-radius:50%;-moz-border-radius:50%;border-radius:50%;bottom:-40px;opacity:0;/*box-shadow*/-webkit-box-shadow:0px 3px 8px rgba(0,0,0,0.1);-moz-box-shadow:0px 3px 8px rgba(0,0,0,0.1);box-shadow:0px 3px 8px rgba(0,0,0,0.1);/*transform*/-webkit-transform:scale(0.2);-moz-transform:scale(0.2);-ms-transform:scale(0.2);-o-transform:scale(0.2);transform:scale(0.2);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;}.md2-wrapper li a:hover span{opacity:0.9;bottom:50px;/*transform*/-webkit-transform:scale(1);-moz-transform:scale(1);-ms-transform:scale(1);-o-transform:scale(1);transform:scale(1);}.md3-wrapper{padding:0;width:435px;height:70px;margin:80px auto 30px auto;}.md3-wrapper li{float:left;}.md3-wrapper ol,ul{list-style:none;}.md3-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;position:relative;z-index:2;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;}.md3-wrapper li .md3-gplus{background-position:0px 0px;}.md3-wrapper li .md3-twitter{background-position:-68px 0px;}.md3-wrapper li .md3-facebook{background-position:-204px 0px;}.md3-wrapper li a span{width:80px;height:auto;padding:10px;left:50%;margin-left:-55px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:5px solid #fff;background:rgba(255,255,255,0.5);text-indent:0px;position:absolute;pointer-events:none;bottom:-40px;opacity:0;/*box-shadow*/-webkit-box-shadow:0px 1px 2px rgba(0,0,0,0.1);-moz-box-shadow:0px 1px 2px rgba(0,0,0,0.1);box-shadow:0px 1px 2px rgba(0,0,0,0.1);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;/*transform*/-webkit-transform:rotate(0deg) scale(0);-moz-transform:rotate(0deg) scale(0);-ms-transform:rotate(0deg) scale(0);-o-transform:rotate(0deg) scale(0);transform:rotate(0deg) scale(0);}.md3-wrapper li a:hover span{opacity:0.9;bottom:100px;/*transform*/-webkit-transform:rotate(-90deg) scale(1);-moz-transform:rotate(-90deg) scale(1);-ms-transform:rotate(-90deg) scale(1);-o-transform:rotate(-90deg) scale(1);transform:rotate(-90deg) scale(1);}.md4-wrapper{padding:0;width:435px;height:70px;margin:80px auto 30px auto;}.md4-wrapper li{float:left;}.md-wrapper ol,ul{list-style:none;}.md4-wrapper li a{display:block;width:68px;height:70px;margin:0 2px;outline:none;background:transparent url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYfIEZ6Inf2iUVaDEHsXcIKsTS2MVVkZXnQ6BBGbpCRFmUy_46uWfZqnYj7A1eUx7RkA8FVSSAWUJl4jXRUXXKeXwrcANmtL1I61picTIRC6st2gQcXVTKTpz5WF6IVu9uUCljKtty85S-/s1600/%255Bwww.gj37765.blogspot.com%255D_social_gunman_icons.png) no-repeat top left;text-indent:-9000px;position:relative;}.md4-wrapper li .md4-gplus{background-position:0px 0px;}.md4-wrapper li .md4-twitter{background-position:-68px 0px;}.md4-wrapper li .md4-facebook{background-position:-204px 0px;}.md4-wrapper li a span{width:100px;height:auto;line-height:20px;padding:10px;left:50%;margin-left:-64px;font-family:'Alegreya SC', Georgia, serif;font-weight:400;font-style:italic;font-size:14px;color:#719DAB;text-shadow:1px 1px 1px rgba(0, 0, 0, 0.1);text-align:center;border:4px solid #fff;background:rgba(255,255,255,0.3);text-indent:0px;/*border-radius*/-webkit-border-radius:5px;-moz-border-radius:5px;border-radius:5px;position:absolute;bottom:70px;opacity:0;visibility:visible;pointer-events:none;/*box-shadow*/-webkit-box-shadow:1px 1px 2px rgba(0,0,0,0.1);-moz-box-shadow:1px 1px 2px rgba(0,0,0,0.1);box-shadow:1px 1px 2px rgba(0,0,0,0.1);/*transform*/-webkit-transform:translate(35px) rotate(25deg) scale(1.5);-moz-transform:translate(35px) rotate(25deg) scale(1.5);-ms-transform:translate(35px) rotate(25deg) scale(1.5);-o-transform:translate(35px) rotate(25deg) scale(1.5);transform:translate(35px) rotate(25deg) scale(1.5);/*transition*/-webkit-transition:all 0.3s ease-in-out;-moz-transition:all 0.3s ease-in-out;-o-transition:all 0.3s ease-in-out;transition:all 0.3s ease-in-out;}.md4-wrapper li a span:before,.md4-wrapper li a span:after{content:'';position:absolute;bottom:-15px;left:50%;margin-left:-9px;width:0;height:0;border-left:10px solid transparent;border-right:10px solid transparent;border-top:10px solid rgba(0,0,0,0.1);}.md4-wrapper li a span:after{bottom:-14px;margin-left:-10px;border-top:10px solid #fff;}.md4-wrapper li a:hover span{visibility:visible;opacity:0.9;/*transform*/-webkit-transform:translate(0px) rotate(0deg) scale(1);-moz-transform:translate(0px) rotate(0deg) scale(1);-ms-transform:translate(0px) rotate(0deg) scale(1);-o-transform:translate(0px) rotate(0deg) scale(1);transform:translate(0px) rotate(0deg) scale(1);}</style>
