It goes in waves. They appear, stick around for a week or two, and then they die down. Then they reappear a few months later. Or something new comes up.
Think the last big thing for threadmaking was "the *something here* den"-type of threads, and before that, "*Random user* appreciation"-threads.
As for what the deal is, I dunno.
I have one somewhere too I think.
They don't really bother me.
Are you active on any other site(s)?