The Federal Trade Commission has signaled that it may at least temporarily block Google's buyout of AdMob, a set of leaks from within the process hinted late Thursday. As part of its investigation, the FTC is reportedly asking "at least two" companies to sign statements that would likely argue that the mobile ad deal abuses Google's web dominance. Such testimonies are usually gathered when FTC agents believe the Commission will block or change a deal, WSU professor Stephen Calkins told Bloomberg.