PUBLIC MARKS from sbrothier with tags facebook & twitter

This infographic allows you to explore the categories of information that various social networks make available to other applications. If you log in to a Web site with your Twitter account, this is what Twitter sends about you to the site. If you play Farmville on Facebook, this is what is sent to Farmville. Those applications, in turn, often give data about your activities back to the social network. These exchanges of information take place through what’s known as an application programming interface, or an A.P.I. Read more here. (To use the infographic, click to zoom in and see specific fields; click on the black bar to zoom back out.)

To create the default sign-in button, add a class of btn-auth and btn-[service] (where [service] is one of the supported social sign-in services) to any appropriate element (most likely an anchor).

Following in the footsteps of commenting systems Echo, Disqus and Intense Debate, WordPress.com has launched WordPress, Twitter and Facebook authorization and identity systems for its own commenting platform, in that order. The blog host didn’t even have the WordPress.com option before.

the next generation commenting system. It’s the way to share your content, and watch the live reaction. You can quickly embed Echo on WordPress, Blogger, or any website and turn your static pages into a real-time stream of diggs, tweets, comments and more.

the way to share your content, and watch the live reaction. Publishers can quickly embed Echo on any site and turn their static pages into a real-time stream of diggs, tweets, comments, ratings and more.