It is more like they are blackmailed that they will lose access to their friends if they leave. We don't use fb because it is a good product. We use it because

It is more like they are blackmailed that they will lose access to their friends if they leave. We don't use fb because it is a good product. We use it because it was 'hot' and now we are stuck with a company that agressively (ab)uses its network effect to gain profit and other benefits for itself.