the question of "how many?" is hard to answer. it depends on who you ask and how you ask. DAU, total pubkeys that have ever published an event, total pubkeys with profiles, etc.

as to karnage's comments, I agree entirely. but I also recoil a bit from the social media aspect. I like having our own, very hackerly space to be social, but I also think the best apps haven't been built yet. the long form, slow cooked content, rss feed-like stuff. forums too. I really am here for the pki