I have zero faith that any new social media ecosystem that emerges in the absence of Facebook would be more secure, or more private -- especially if the new eco

I have zero faith that any new social media ecosystem that emerges in the absence of Facebook would be more secure, or more private -- especially if the new ecosystem consists of multiple independent services sharing data (and if it doesn't turn out that way, that means a new monopoly emerged). A single large company is also easier to regulate than a bunch of smaller ones. If you are concerned about monopoly power over social media, go ahead and break up Facebook. If you are concerned about privacy and the security of social media data, you are probably better off regulating Facebook and raising high barriers to anyone who wants access to Facebook's data.