'Hacked' users will receive email from Twitter

Twitter said users whose security was compromised will be receiving an email with instructions to create a new password.

"Your old password will not work when you try to log in to Twitter," said Bob Lord, Twitter's director of security.

He added:

We encourage all users to take this opportunity to ensure that they are following good password hygiene, on Twitter and elsewhere on the Internet.

Make sure you use a strong password – at least 10 (but more is better) characters and a mixture of upper- and lowercase letters, numbers, and symbols

– Bob Lord, Twitter

Twitter also advised that users do not use the same password more than once across other services and accounts.

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Hackers steal Twitter passwords

Twitter says a quarter of a million of its users have had their accounts details stolen. The social networking site revealed its security had been breached by large-scale cyber attacks.