I notice something, maybe u guys have also, and... Although, I do not have an idea how this cold be prevented, I'll post what is the problem, so we at least can discuss it?
In some cases ppl use art thread to boost their post count. There, I said it.
It's sometimes too obvious (like: same guy comments in 5-7 threads in a row posting: I like ti x/10! + [add some random: ''see ya soon'' message here]), and sometimes it's better planed so it spans multiple days posting same thing in different threads.
Now, I know it's hard to distinguish real comment from these ''fake ones''. That is the problem of the whole story.
Just saying it aloud to see did u noticed the same thing and what do u think about it.