The only thing I've noticed is that when "newbies/junior members" open a thread, in most cases the did not leave any post after they've opened it.

Often they ask different question or share their opinion. They get numerous answers or posts where people disagree with them. But they never post back. They dont post a single "Thank you" after they got posts with answer to their question or a step-by-step guide with solution to problem they had. Or for example they claim that "the earth is flat" and want to discuss that, but never respond on opposite facts other users present.

I cant explain why they behave like that. Sort of a posting to get more activity on account.