I believe i read once that facebook has highly correlated people's engagement when interactions are more or less positive. So it might make sense to have a team work on creating mechanisms that improve the interactions so they trend more positively. Though i'm sure its sold as facebook "just trying to make a difference"

They work on a big gamut of things, including but not limited to protecting your account from getting hacked, helping you recover your account if you do, impersonations, spam, etc. It' s not just "help people act nicer" :)

I think this is a great sign- there have been so many stories of teenagers committing suicide from public ridicule on the Internet, FB is really helping their users by creating a safer and nicer place to exist online without fear of cyber bullying by taking this action and really devoting resources to save lives.

You should, because there is.