http://hollandonrails.nl/articles/547-Easy-Authentication-with-OmniAuth If you ever want to implement OAuth or OpenID to authenticate and connect users with different accounts, you should check out the OmniAuth gem! This piece of Rack middleware takes care of all the difficult stuff like having to implement and understand all the different API's. It makes it very easy and clean to implement authentication with (for example) Twitter, OpenID and Facebook. There are two excellent railscasts available on how to implement the oauth gem: * "http://railscasts.com/episodes/235-omniauth-part-1":http://railscasts.com/episodes/235-omniauth-part-1 * "http://railscasts.com/episodes/236-omniauth-part-2":http://railscasts.com/episodes/236-omniauth-part-2 More information about this gem can be found at the "GitHub Page":https://github.com/intridea/omniauth Tip: If you need nice twitter and facebook buttons on your authentication page, you can find them "here":https://github.com/intridea/authbuttons