[brazzy]

The steps from 4 to 7 seems to me not to be at all inevitable. Facebook provides pretty solid and sustainable value in allowing you to keep in touch with people you know. It does not require excitement, hype and obsession for that.

Of course, if usage intensity declines, so does revenue (but also costs).

[sifarat]

the advantage or significance of facebook is that, it has been able to prolonged these phases.