I deactivated my FB account about 8 weeks ago but was mostly positive whilst there as I am mostly positive anyway.
I do however have an aversion to following things when told to on networks, or even generally. It ruins the search for inspiration or reason so I avoided such things during my FB experience. I sometimes like to observe others participating in such activities but it is rare. For example, the wearing no make up for cancer thing annoyed me greatly. Now, I don't really wear make up often aside from subtle mascara which can become more daring of an evening, yet many posted without donating. What was the point of that? There was in fact no point.
So, if a comment is positive it is of itself useful. If it encourages others to see things a little more clearly, great but I do wonder if really things could be so awful as we need to prod others into action, which may not be genuine.
Still, I don't mind that much really - but feel glad to be missing this on FB.