Single package to allow signing in with oauth through several social networks?

Question

I'm looking for a way to allow users to sign in to my site using Twitter, Facebook, LinkedIn, and Google. A good example of a site that does this is Answers.com, on the homepage they have a set of buttons, and each button gives a simple pop up window to confirm the connection.

I know that I can implement each connection individually, but I want to know if there is a single package that provides all of this functionality for the different social networks.

Edit: I'm looking for a package in PHP.

Answer 1

Those sites, just like this one, implement OpenID or OAuth. So just do a search for OpenID PHP or OAuth PHP and you'll find a bunch of information. (I have not implemented either in PHP, but we are considering implementing OpenID in .NET.)