Twitter locks accounts after log-ins go on sale

On Thursday reports surfaced that a Russian hacker called Tessa88 was asking for 10 bitcoins (£4,000) for access to a list of 32 million names.
In a blogpost, Twitter said it was confident that the data had not come from a hack attack on its servers.

But after scrutinising the list, it had locked some accounts and users would need to reset their passwords.

"The purported Twitter @names and passwords may have been amassed from combining information from other recent breaches, malware on victim machines that are stealing passwords for all sites, or a combination of both," wrote Michael Coates, chief security officer at Twitter, in the blogpost.
Security firm Leaked Source