I think facebook can feel 'private' sometimes, especially when we are sharing photos of good times with other friends who were with us but it's anything but.
I think the last few weeks running up to the elections with the terrorist attacks there have been a lot of things said and shared on fb which are not so good to share. There's been a lot of anger out there and fb is a platform some use to vent from. I'm warier of it than I was before.
Basically I'm on it for the cute animal videos.