Social media content isn't hosted on their property. If they can't comply with such laws they should delete these accounts rather than claim digital squatter's rights.
Isn't Facebook arguing that they have become a public square though? If we accept that argument, then they can't have it both ways - a merchant who has set up a booth on the public common is not a squatter. While subject to the rules of the common, they still retain full control over their booth and wares.
