I'm skeptical that "breaking them up" would really do anything. People would continue to use the thousands of other platforms that are out there, but there would still be a desire for a sufficiently abstract social network that another one would grow. Then there would be calls to break that one up...
To fight against large social networks is to fight against natural human organization and interaction. Attempting to is pointless and probably even harmful, since the velocity of good ideas would be reduced along with the bad.