Personally, I regard any posts with the intention of simply bumping threads to be extraneous. Most recruitment is done outside of this forum, and to be quite honest usually only groups with large amounts of people can conduct this strategy with success, that is, not being noticed my the administration. Smaller groups who try this are more often then not seen to be spammers over the rest of the larger groups, simply because only 4 people continually posting small, often less than 10 word posts are more noticeable than 12 people doing the same.
Much love to larger groups, but everyone's at fault here with their "bumping". If anything, there should be a rule to ensure that the conversation has at least SOME sort of texture to it..... But, then we come to the area of muddy opinions. I'll take a look into this.