I recently got an infraction for thread bumping. By thread bumping I mean making a post that says something non-substantive like "anyone?" just in order to move the thread to the top of the thread list. I have bumped threads probably a hundred times since I joined here and had never received an infraction before. I am not angry about the infraction, I am just pointing out that PF should decide one way or the other and put their decision in their guidelines for new members to read. The benefit is that the OP can show that she is still interested in the question and allow new people to read the thread. I think a lot of people just look at the most recent threads and since the posting rate in the homework help section is so high this means that someone who might know the answer might not see your thread. Also, someone might get an insight the second time they look at your problem which they might not do if it fell to far in the list. The disadvantages of this practice are of course that it wastes memory on the PF server just for like one-word threads and it can crowd out new threads. Again, I am not angry about my infraction, I just think that PF should explicitly articulate a policy on this and be consistent about enforcing it.