There is a parent FB group run by one of my kid’s colleges. But… I will say, there are challenges. Parents sometimes come on to rant about a particular gripe that is clearly colored by one kid’s experience. Sometimes they pass on rumors they heard from their students that are not true. Once a student passed away, and a parent posted a link to an article very graphic and distrurbing description of the student’s accidental death – I’m sure it would have been distressing to the student’s parents and friends to read it. Sometimes parents will bring up issues from past years and get parents of new frosh concerned about things that aren’t even issues any more.
The college has sort of a parent liaison to the page who does have the power to take things down when they are very inappropriate (like the graphic article). (Not me). Kind of like a mod. :). Occasionally I have a back channel IM with another parent about the impact of their posts on new families-- sometimes the parents then modify or remove the posts.
This fall parents have been using it to post lots of pictures from move in and orientation photos their kids sent them.
I think having a “mod” type role at least is a good idea.