Twitter tightens security

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Twitter said it would implement a new login verification system, "a form of two-factor authentication" which is "a second check to make sure it's really you" when a user signs in.

The security system will send a text message to the user's mobile phone with a verification code that would be entered for the login.

"You'll need a confirmed email address and a verified phone number. After a quick test to confirm that your phone can receive messages from Twitter, you're ready to go," Jim O'Leary of Twitter Product Security said.

Twitter said the new system would be an option for users, and would allow them to require a verification code for each sign-in.