I thought I had read something on the forums a while back that stated they won’t be reopened until the content advisory options were working again. Not sure what the hold up is, but since this is a “family oriented” site, they’re not going to open them up until folks have the option to block nudity, violence, etc. Makes sense to me.
I don’t use Facebook, and I’m not yet clear how one submits images to them, or if this is a temporary thing while waiting for restoration of the galleries as they used to be. I know one of the fun added perks of the old gallery submissions was of course the faint chance of winning; not sure if that’s something you can do here too or not.