True. As long as users can use any tag as they want, the tribe curators will always run behind trying to filter out those posts which don't fit the topic.

That's always been an issue with online communities. Keeping the interactions on topic requires either a very focused and dedicated group of people who are involved in the community or an extremely energetic and attentive moderation team. And even allowing for both, topics wonder, communities engage in personal asides, and all the rest of the fun happens. It is, not put too fine a point on it, "quite hard."

My suspicion is that a number of Communities will be very interested in building a front end which allows them to keep new posts in a corral, not committed to the blockchain, until they can actually be okayed by a moderator. That wouldn't be a new mechanism; pretty much everything in this field has been done at one time or another. And we will see some reimplementations of things which have gone before, like trusted users who can post without going to the corral first, groups which by default have new users not go to the corral until they make a misstep, all the rest of the ways that mailing groups, newsgroups, and forums have found to deal with potential abuse or just misuse.

It might just be a side effect of the places I've been exposed, but I haven't seen a lot of Communities or Tribes talking about these kinds of mechanics or problems out in the open. Maybe those discussions are happening behind closed doors and I would certainly encourage them to happen, but I haven't seen them happening and that makes me a little worried.