Plusone-button. Documentation You can add and customize the +1 button to meet the needs of your website, such as modifying the button size and load technique. By adding the +1 button to your website, you allow your users to recommend your content to their circles and drive traffic to your site.
The +1 button can also improve the time spent on your site by providing recommendations for further reading. Use of the +1 button is subject to the Google+ Platform Buttons policy. Getting started A simple button The easiest method for including a +1 button on your page is to include the necessary JavaScript resource and to add a +1 button tag: The script must be loaded using the HTTPS protocol and can be included from any point on the page without restriction. . +1 tag To render a simple +1 tag: You can also use a HTML5-valid +1 tag by setting the class attribute to g-plusone, and prefixing any button attributes with data-. By default, the included script traverses the DOM and renders +1 tags as buttons. Configuration.
Like Button - Desarrolladores de FAcebook. CSS3 video tutorial - learn CSS3 // Think Vitamin Membership. W3Schools Online Web Tutorials. Smashing Magazine.