"In recent weeks, however, Facebook has been valued at up to $85bn on the secondary market," FT.com points out -- which would value Interpublic's stake at closer to $300 million. "The position in Facebook is not that substantial compared with Interpublic's overall revenues, which totaled $6.53 billion last year," adds FT.com. "But the value of the stake is welcome for the group, which is recovering from a tough few years during the recession." Interpublic was originally able to secure its share by committing to spend $10 million for its clients on Facebook.