Facebook's ubiquity makes them indecipherable from any television network, except far more powerful. No terrestrial or cable network has a reach of 2.4 BILLION people (214 million in the U.S. alone)
Doesn't matter. If they don't fit the definitive, legal description of a media outlet per the FCC or the IRS guidelines, then there's nothing you can do about it. Except tell your Congresscritter to pass legislation then.