What would you do?

[Jaycee]

I'd definitely tell her parents. At that age, they should be monitoring her facebook account anyway.

[Lisa]

Definitely say something. I monitor both of my kids (13 & 16 yr olds) FB pages and I kinda monitor their close friends too. One of my DD's friends added some creepazoid from Indonesia who is 60! I sent the message through my DD to get her friend to delete the guy and watch out for who she adds from now on. I can not believe some parents don't pay that much attention to what their kids are doing online.
I hope your inlaws don't take it out on their DD but have a good talk to her about internet safety.

[*LittleMissSummer*]

I have spoken to my other SIL and she is going to sit our niece down and talk to her about who she should be friends with and who she shouldn't. We have to be careful in what we say to her mother as she is always quick to punish her without listening to the details.

But if it isnt rectified in a matter that i am happy with, like my niece has a go at us then i will let her parents know. I hate to be the party pooper but when it comes to internet safety i take it VERY seriously.

[Lulu]

I'm pretty sure your niece would know he isn't a vampire though.

[miss.cinders]

Tell her Parents!!!!

I have two teens on FB and I would want to know if it was one of them.
Keeping your niece SAFE is #1 priority, not being the cool aunt who keeps things from her Parents when they [whatever the secret] could be dangerous to her.