This isn't feedback but it is a question about the site so I put it in here.

How often are the forums pruned? Is it an automatic process, like a chron-job or is someone hopping on every so often and hitting the prune button? Also, is there any structure to how the forums are pruned? I noticed that some forums, like FFVI and EoEE have threads dating back to mid-November while General Chat's oldest thread is only from December 7th. Just wondering what the rhyme and reason to it all is.