I know for sure some of them snoop. Some years back the elders wanted to talk to me but didn't tell say what about. We met one night at a coffee shop that had wireless internet access and they pulled up about 20 different myspace pages from kids in our hall as well as others. needless to say there were some pretty incriminating evidence on a number of teenagers. Girls had provacative pics of themselves and there was a lot of bad language used.
While looking through one page there was a picture of some friends and me rockin' out in our punk/metal band at graduation party we played. All I could think was "Oh Crap!". But they didn't seemed to be to bothered. One of those elders was a punk enthusiaist himself. At the hall they put all the teens in the front rows and gave a local needs talk about myspace and told parents to interrogate thier children to find out.
The reason why they involved me was because some of the individuals who had pages were coming out in my wedding. In the end half of the wedding party was not allowed to participate in the ceremony including my brother and sister in law (Friggin' Bastards).