People were waiting until long after the fact to remove posts that gave a negative viewpoint on the stock. Or just one contrary to what the chairman wanted seen. That way, it was easier for the deletion to escape detection.
Matt, I could go along with having the 24-hour limit (or 48 or whatever) only on stock-specific boards. There are a few posts on the BOWIE board that shouldn't be there, but I was too slow noticing, and the 24 hours expired.