Why is reccr asking you to sign in via Facebook or Twitter? It's simply so that
reccr can rely on another service to verify that you are you. It means that you don't
have to come up with another password just for reccr, and it means that reccr
doesn't have to worry about storing passwords and keeping them secure.
reccr will NEVER post anything to your Facebook, or Twitter, or any other service
without your explicit permission.