Because it's hard to create niche networks that are simpler or easier or more compelling than Facebook. And if you do, Facebook will eventually buy someone who

Because it's hard to create niche networks that are simpler or easier or more compelling than Facebook. And if you do, Facebook will eventually buy someone who does the same thing and incorporate. Now I notice that other tech giants have been emulating Cisco's model of constant acquisitions to adapt to rivals. For example, if Twitch ever threatened its market share, it could simply make or buy its own Twitch, considering it already has all the same resources.