Definitely Mark defies markets and people are pulling out. Estimate forecast revenues are used to determine future value in the short term. That 100 value are the people believing in the long potential and existing value.
If Mark is right and the browser is the past, and googles are the future (what does a future like that smell like? - unbox therapy) he could become even more wealthier, if he is wrong (most certainly he is, 3D tv didn’t make it) fb will continue to decline. Until the value is the core business minus ceo risk minus fun projects.