I think it is true that Facebook does affect self-esteem. I know this as a fact because I've been on that end where, if I see a certain status or photo, I tend to feel worse about myself. I try not to use it much. I don't post because I don't feel like I have anything worthy to say. And I don't post 'selfies' because it'll make me seem vain. In a way, I'm very cautious about what I post. But if there's something I don't want to see, I hide it right away, unfollow or defriend.