To answer the original question: around, but not really active, as @i-am-insane said.
DD is pretty niche despite having, what is frankly, a pretty broad scope of what type of size content it allows. This is not a criticism; in fact, it is why I personally prefer to come here for my M/f needs, because I don’t need to browse through countless posts that don’t appeal to me. Or have posts being buried under said posts and not getting to the audience I wanted to share with. Unfortunately, that does also mean fewer (active) users and relatively less and regular activity than the larger sites.
In saying that, I think activity levels also come in waves. I, as well as others, were regularly posting/sharing things on here about a year(?) ago, but (and I don’t want to speak on behalf of everyone) we slowed, in part, because we had other things going on in our personal lives. It’s very hard for a relatively small group of regulars to keep that momentum up as we dropped off, one by one.
So…at the risk of sounding very obvious: I encourage you (universal “you”) to 1) post; 2) keep posting; and 3) don’t be discouraged if you don’t get the hits you want. Building up takes time.