To the average person, Facebook’s monopoly seems obvious. “After all,” as James E. Boasberg of the U.S. District Court for the District of Columbia put it in his recent decision, “No one who hears the title of the 2010 film ‘The Social Network’ wonders which company it is about.” But obviousness is not an antitrust standard. Monopoly has a clear legal meaning, and thus far Lina Khan’s FTC has failed to meet it. Today’s refiling is much more substantive than the FTC’s first foray. But it’s still lacking some critical arguments. Here are some ideas from the front lines.