I refer to this thread
The Social Networking ConundrumIts now 2 years since that problem and in the end I accepted the request. F**K me I never had that many issues when I was a teenager
Generally it has been ok and as I suspected I'm only a number and a substitute mother when she can't get hold of her using either FB as I have access on my mobile or my work phone as she was smart enough to work out my direct number

oh also scored an invite to a birthday party of hers via Facebook. I wasn't going to go originally but her mum gave me so much shit about not going I had to attend which worked out ok as there were people even older than me there and they had a massive TV to watch the footy on
I did keep a close eye on her for inappropriate posts and did ask on several occasions if she was ok. She is quite small (younger sister is taller than her) and has massive cans for her height so plenty of people used post comments about being short etc.
Only once or twice had to mention it to her mother. Now not so much as in the last month her mother signed up.
I very rarely post updates only if something really ticks me off. Geelong stuffing up my footy tips has got more recent mileage.
Don't have many friends that post shit for the sake of it a couple have come very close to overstepping the mark though.
I have the highest privacy settings available including authorisation of check ins, tags, and posting on my wall.