Over the past few days I've been lurking around at, and even posting on a few other forums on Postloop. I've ran across a number of Postloop posters and thought "oh man, that's a load of crap I hope this guy doesn't join my forum!" That, in addition to some bad experiences I've had with other people directly on Postloop made me think that some sort of a blacklist feature would be useful. If I could enter the usernames of the rotten apples and then they wouldn't be allowed to subscribe to any of my forums, that would give me piece of mind, but also it might give the Postloop administration (Ryan) an advanced clue on where future trouble might be coming from. For example, if one person adds someone to a blacklist you could chalk that up to personality clash, then if a second, and third, and fourth, etc add the same person then you might want to have a closer look at what's going on there.