Time bought Myspace from Viant — which was earlier known as Interactive Media Holdings and Specific Media before that — in February this year. Prior to that, from 2005 to 2011, Myspace was owned by News Corporation which bought it for US$580 million. It was sold to Specific Media for just US$35 million.
In a posting on Tuesday, Myspace said that shortly before the Memorial Day weekend - the last Monday in May - it became aware that stolen user login data was being made available in an online hacker forum. "The data stolen included user login data from a portion of accounts that were created prior to June 11, 2013, on the old Myspace platform," it said.
The company said it had reason to believe the hack had been carried out by the Russian cyberhacker known as "Peace".
Myspace said email addresses, usernames, and passwords for affected accounts created prior to June 11, 2013, on the old platform were at risk.
"As you know, Myspace does not collect, use or store any credit card information or user financial information of any kind. No user financial information was therefore involved in this incident; the only information exposed was users’ email addresses and Myspace usernames and passwords."
The company said in order to protect its users, all user passwords for affected accounts created prior to June 11, 2013 on the old Myspace platform had been invalidated. "These users returning to Myspace will be prompted to authenticate their account and to reset their password by following instructions," the company said.
Tumblr did not provide anything like the information that Myspace did.
On its website, there was a short note: "We recently learned that a third party had obtained access to a set of Tumblr user email addresses with salted and hashed passwords from early 2013, prior to the acquisition of Tumblr by Yahoo!.
"As soon as we became aware of this, our security team thoroughly investigated the matter. Our analysis gives us no reason to believe that this information was used to access Tumblr accounts. As a precaution, however, we will be requiring affected Tumblr users to set a new password."
Users were directed to its account security tips.