Here are some relating threads:
59) The unactive threads are the ones you created.
60) That threads become popular when they have 5 months of unactivity, and so they became closed.
61) Someone makes a similar thread after that, and the thread becames popular in a few minutes.
62) You get he best ideas for a thread when everyone's offline.
63) When everyone's online again, the thread is on the second page. (see number 61)
64) When you disable reputation is when everybody's thinking to give you some.