This is the best tl;dr I could make, original reduced by 83%. (I’m a bot)
“The court should deny Facebook’s motion,” the commission said in a document filed late Wednesday, arguing that “Facebook holds monopoly power over personal social networking services in the U.S., and is violating the antitrust laws by maintaining its monopoly through means other than competition on the merits.”
In March, Facebook argued in its motion to dismiss that the FTC’s lawsuit was legally defective because it failed to identify a relevant market in which the company purportedly holds a monopoly.
Facebook said the FTC also had no authority to sue over actions it had already approved: Facebook’s acquisition of messaging service WhatsApp in 2014 for $19 billion, and its acquisition of photo-sharing site Instagram in 2012 for $1 billion.