A single package to enter the system through several social networks?

Question

I’m looking for a way to allow users to access my site using Twitter, Facebook, LinkedIn and Google. A good example of a site that does this is Answers.com , on the home page they have a set of buttons, and each button gives a simple one to confirm the connection.

I know that I can implement each connection separately, but I want to know if there is one package that provides all these functions for different social networks.

Edit: I am looking for a package in PHP.

Answer 1

Those sites, like this one, implement OpenID or OAuth. So just search for OpenID PHP or OAuth PHP and you will find tons of information. (I have not implemented it in PHP, but we are considering the possibility of implementing OpenID in .NET.)