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Along with signing up via Google or Yahoo, New  and current members will be able to  to sign up and sign in with Twitter, starting  today.

Using Twitter Sign-Up

Unlike Facebook, Google and Yahoo, Twitter does not share users' email addresses when they sign up with Twitter on any website. Not only was this the reason we had to wait until the to add support for Twitter, but visitors who sign up with Twitter will be asked for their email address when signing up. They will not need to create a password, though, and signing in with Twitter will be just as easy as with  Google or Twitter — all it takes is a single click!