[FirstAndFinest]

I agree that the "hi, i'm new here" threads ought to be pruned. I don't know if there is a whole lot of value in a 6 year old thread, but I don't know if there is anything to be gained by deleting it. If there's no benefit to pruning, and I'm sure it will take some time to do, then I say to let old threads stay. If there are any duplicated threads, those could either be combined or pruned.