I also think it's time for them to cash in. It could be that FB is a fad that will phase out in a year or two, just like a popular night club has a half-life of

I also think it's time for them to cash in. It could be that FB is a fad that will phase out in a year or two, just like a popular night club has a half-life of about 6 years. However, it may be one of those things that will be around until it's displaced by something disruptive. Concerning the revenue stream. Half a billion sounds significant, but maybe not even enough to break even.