I don't face any major problems, just people spamming their links.

lol

I run a teens site, so my number one problem is DRAMA. Spam a can take, but drama is a lot harder to deal with.

Mine has always been about activity. My site was too niche, once it was handed over to me by the previous owners, and interest was already dwindling among the regular users. That combined with my inexperience and inability to fix some of the features of the site that people had come to appreciate as unique about it, interest just fizzled out. I've tried a few things over the years, but mostly my site has been my place to tinker, and learn what I don't know. Now I'm just going to shut down and see if I can address the issue of activity by refocusing the site to something less niche. But, yeah, activity has always been my problem.

Drama I can deal with. I don't allow it. Maybe that had something to do with it, too...