"Antitrust law can be complex, but these actions aren’t. It’s just stealing. Facebook wants people to see this suit as just some disgruntled media outlets or advertisers, and some frustrated ex-employees angry at a successful business. The problem, for Facebook, is that this isn’t a one-off. It is the THIRD time Facebook has been caught for lying to advertisers in order to steal their money."
This is a good summary of Facebook’s current round of trouble, including the Australia news-sharing thing.