I have an account on there, but it just doesn't have enough users yet to produce a viable online community, and it's moving so slowly that I can't see how it's ever going to (though they could always surprise me!). If I want a rather small social media platform where I can talk to people, DW/LJ has everything I like about Pillowfort, comparatively more people, and an interface I find much easier to use and more fun. And then Tumblr is where I go for a big active fandom community and the possibility of connecting to new people in fandom. Pillowfort just doesn't have anything those places don't. Maybe if it got bigger, it would.