L.P.
I love pinning and having people pin my pins or be able to see other people's pins. I spend less time online looking for ideas now. I follow people with similar taste so it makes seeing something cool even easier (like having my own assistant doing the looking for me). I'm one of those people who loves to share my knowledge. It drives me crazy at work when people keep a method a secret... I write it all out for the next instructor to have when I leave. I know some people get a bit unnerved by stuff they don't mean to share explicitly but online, you have to get used to it (and mind what you post!). I love the secret boards though. Finally a place I can put gift ideas on!
And for me, I disable FB and other newsfeeds for everything I do because I like to control that aspect. I pin so much it would be a horror for non Pinterest friends to have to see it on their newsfeed. Right now there is no "stalker" aspect to Pinterest so I'm not too concerned about that. The only people who stalk me are my friends anyway. =)