Open IDs

TwitterFacebook
Get flash to fully experience Pearltrees

FB account registration

Facebook Platform enables you to make your web site more social. You can use our Social Plugins , such as the Like Button to drive user engagement with a single line of HTML. Our Login Button and Registration Plugin let you simplify or eliminate your own user registration and sign-in. http://developers.facebook.com/docs/guides/web/#registration

FB single sign-on

Facebook Platform enables you to make your web site more social. You can use our Social Plugins , such as the Like Button to drive user engagement with a single line of HTML. Our Login Button and Registration Plugin let you simplify or eliminate your own user registration and sign-in. http://developers.facebook.com/docs/guides/web/#login
https://dev.twitter.com/docs/auth/sign-twitter

"Sign in with Twitter"

Updated on Wed, 2012-09-26 12:20 Place a button on your site or application which allows Twitter users to enjoy the benefits of a registered user account in as little as one click. Works on websites, iOS, mobile and desktop applications. Features

OpenID Wiki / Libraries - Mozilla Firefox

http://wiki.openid.net/Libraries The following libraries are available to assist with the implementation of an OpenID Identity Server and Consumer.