I would like to connect to those applications which provided OAuth API (such as fb, twitter).
Is there a relatively easier way to integrate those APIs?
I have successfully used linkedin gem which can connect to LinkedIn OAuth API. But I really don’t want to install a gem for dealing with a single application, where those applications provided similar OAuth APIs.
Well, both fb and twitter are pretty custom versions of OAuth, so I think you’ll end up needing a gem per app. But!
Authlogic provides some nice plugins for open-id, twitter, and facebook.