title: Rails devise - Facebook + Twitter +
body: <p>I'm thinking to use devise gem for a new Rails app I'm working on.
  I'm a bit confused about a thing. The app will allow the user to connect to FB, Twitter and possibly other social network (Foursquare, etc..).
  I know that with devise + omniauth-facebook you can allow the user to register to your site by FB user (or same applies to twitter).
  I just wonder: if you allow the user to login by FB user and then you also want to connect the same user to his/her twitter account, does devise support this?</p>