Pew research did a study recently on teens and facebook. Big news, it's getting b-o-r-i-n-g!!!!! I could have told them that a long time ago. I just don't get the same buzz anymore.
That doesn't mean that your teen will spend any less time on it, it just doesn't feed the "new is better" addiction. According to the study: "Teens are migrating to Twitter and Instagram, which teens say offer a parent-free place where they can better express themselves. Eleven percent of teens surveyed had Instagram accounts, while the number of teen Twitter users climbed from 16 percent in 2011 to 24 percent in 2012."
Hmmm, what does: "better express themselves" really mean? Just giving you a heads up. Facebook might be their "safe for parent viewing" to get you off the trail. Maybe they are not posting much these days, just keeping up with their post-ers, and putting their more "creative communication onto twitter!