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On Greepit.com there's a new post spotlighting a single handy library you can use in your PHP application to make authenticating with many of the popular social network providers simple - HybridAuth.
HybridAuth is an open source web-based authentication and authorisation solution that combines the strengths of several major social networks and Identity Providers services into one simple PHP Library. [...] This PHP Library for social services authentication supports many social platforms including Facebook, Twitter, Google, Yahoo, MySpace, LinkedIn, FourSquare, OpenID and many other Identity providers.
The library allows you to connect to the various services' authentication points in a standardized way. Supported providers include:
You can find out more about this library on its SourceForce project page.