Interpublic Group sells stake in Facebook, boosts buyback by $100M Interpublic Group (IPG) announced that it has sold its remaining investment in Facebook (FB) for net cash proceeds of $95M. The company expects to record a pre-tax gain of $94M. Interpublic also announced that its board has authorized an increase in its existing share repurchase program from $300M to $400M. As of September 30, $151M had been used under the authorization. The share repurchase program has no expiration date.