Twitter is trying to figure out how user names and passwords from thousands of accounts leaked an were postde online. Information posted on Pastebin.com pages appeared to be from about 35,000 Twitter accounts, not counting about 20,000 that seemed to be redundancies, according to a message "tweeted" by Twitter.

"We're looking into the situation and have pushed out password resets to potentially affected accounts," Twitter said.

Twitter recommended users change their passwords.