It might be that I joined a pub with very little traffic, I haven't spent much time on it and I plan to have another look when I have some free time.
That said, I suppose the whole thing is inherently quieter than something like Facebook or a forum because it's decentralized and, of course, still a small community at this point. And quite possibly the whole point is not to be as busy as other social platforms :).
I also started to appreciate what's the price for decentralization: after following just a couple of users I already have several hundreds megabytes downloaded.