[hntcz]

The way I see it, an important argument is that it won't solve the problem: these organizations take advantage of network effects to build monopolies and that mechanism won't go away. A good book on this is Who Owns The Future by Jaron Lanier.

Of course, forbidding anti-competitive acquisitions would have helped in that maybe then we'd all be using an independent Instagram under the leadership of its original founders and Facebook would be dying. But that still wouldn't change the fact that it would be more than likely to be a quasi monopoly. That's just the nature of social networks.