I don't know if the problem is trivial to solve, but designing a system which engages one element of the problem is trivial. The part that I was focusing on, was ensuring that any paper that claims to be Reviewed by a scientist actually was reviewed by that scientist.

Great quote. It gets me thinking about Facebook. FB is assuredly a massive technical solution to a social problem. I get Bruce's sentiment, but there are exceptions to this rule.

And what social problem does FB solve?

It's pretty good for staying in touch with people who you wouldn't regularly contact on an individual basis.

Yes, the social solution that Facebook presents is ideal for keeping in touch with a loose or geographically diverse set of real life friends. It is a technical solution to an admittedly simple social problem but a solution it is. Prior to Facebook I used to send graph emails, people would leave jobs, change email, etc etc. then came the cc replies, all out of order. A mess, solved well with Facebook, ad still really the only useful feature.