Silence is when some people only post numbers. Although that's the objective, it (the thread) tends to be for conversation. Even worse is when newbs talk as if the number is the top priority.
Why a non-regular user does itEdit
Oh, a counting game. Meh, might as well help them against the newbs.
Why a regular user might do itEdit
Conversation is slowing down, let's wait for a new topic to arise.
If there's silence for 30 consecutive minutes,
talk about sex throw something out there.