Again, what's the magnitude of this? The way I see it, they aimed for just enough above the noise floor that they could notice some aggregate effects, but low enough that it's below what you'd expect to see in your life at random, every now and then. I honestly think journalists and advertisers do much, much bigger damage here, by constantly exposing us to fabricated, unrealistic dreams of things we can't be and won't have. Compared to that, Facebook is a fresh breeze of honest life experience.
Anyway, I see how people can have problems with Facebook's actions here (though I personally don't, and I'd actually encourage more of such studies - it's an unique vector that could lead to actually meaningful results in social sciences). But the point is, it was totally overblown in media reports, and it still is being totally overblown by commenters on Hacker News. Facebook could not drive you to suicide on purpose by this, so please everyone, stop saying as if they could.
