Hacker news sourceCBS News has learned that hackers are targeting popular social media sites and video sharing sites, and have been attacking them since March.
The hacktivist group Anonymous claimed responsibility for the attacks, which took place last week and lasted until the beginning of May.
Anonymous has claimed responsibility in the past for other attacks on media outlets and websites.
Anonymous has attacked websites and networks including Twitter, which it believes was hacked by the U.S. government.
The group claimed responsibility on Twitter in March for a hack that affected thousands of users.
The group also claimed responsibility last year for another massive hack on the social media site Twitter that targeted thousands of people.
Twitter released a statement Wednesday saying the hack was not related to Anonymous.
The attacks are the latest in a string of recent attacks on social media, which has become increasingly targeted as governments and organizations seek to gain access to the internet.