Is it legal for someone to monitor a facebook or myspace account?

[Dean B]

Perfectly legal.
You'll prob's pick up several tracking cookies everyday, they follow your movemnt all over the web not jsut Myspace or Facebook.
what they do with the data is where it can cross over from legal to illegal, majority just change the ad's that are shown on your web pages, to better match what you do n search for on the web.
I don't completely understand what you mean by " monitored by a private group". are they being monitored cos they asked like the app's that show who's been on your page, or cos they are underage? but about the only way not to be monitored is to not have a Myspace or Facebook account, you post the info on your profile online the rest of the world can see it so you got be pretty open minded on your privacy.
The police won't really get involved with "someone's watching my mates on Myspace". If it was something like the Lori Drew case then maybe.