>much of its value exists on Facebook

This depends on how you define value. If you're talking about advertising revenue, then yes (and bizarrely other services let you authenticate through them, which I still don't understand). But if you're talking about the exchange of practical information, then Facebook's pretty meager and sites with technical documentation or Q&A are much better (for software developers, anyway).

I don't believe network effect is one-size-fits-all. Facebook is fine for keeping up with casual acquaintances. But if you want to find a local group with shared interests, then you may have better luck on Meetup. Or if you want to share Q&A with other developers, Stack Overflow is probably better. Each one has its own domain within which it's king.

I've found a lot of technical documentation on people's personal blogs. Some bit of code they wrote or some problem they solved. We can socially encourage this kind of approach.

Yep, that's great too. There is a challenge there, which is finding that information on personal blogs in the first place. That's been solved with search engines so far. I'm curious if a more distributed, network-oriented approach might work. Basically the Bacon number applied to information.

If people have a means to extract their Facebook posts and publish their content on their own blogs, then that value isn't really under Facebook control. It's a symbiotic relationship, and it's a safe bet that if Facebook were to make the wrong moves, the users would simply leave. Indeed that's been happening in recent months over privacy concerns and other things.