A US man has pleaded guilty to sending more than 27 million spam messages to Facebook users.
US Attorney Melinda Haag said on Monday that 47-year-old Sanford Wallace of Las Vegas, Nevada, admitted in federal court in California to accessing about 500,000 Facebook accounts and sending the unsolicited ads disguised as friend requests over a three-month period.
Wallace acknowledged accessing Facebook's computer network to send the spam messages on three occasions between November 2008 and February 2009.
Haag says Wallace also admitted that he violated a court order not to access Facebook's computer network. He was charged with fraud and criminal contempt.
Wallace is free on bond and scheduled to be sentenced in December. He faces a $US250,000 ($A349,000) fine and up to three years in prison.
