True - plus the fact there are several facebook groups. In essence they seem to consist of almost absolute beginners, and others with very little experience. Plus a few really experienced old hands like the Derek Allens, Martin Platts and Tony Crockers of this world, who offer sound guidance. There's also a few amateurish low level auction/trading sites, and those that double up as both.
The problem with facebook is retrieving old information, or knowing that it even exists. Threads seem to vanish with alarming rapidity, and nothing is retained in any semblance of chronological order. In that sense a forum is much more user friendly - look at the number of times on here that threads, even well over 10 years old, are rooted out and re-posted on/used as a reference tool. Imagine trying to find something on facebook that you vaguely recall from all that time ago. There isn't even a subject line to refer to.