I think I understand why you use the word "farming", but "spamming" might be a better English term to use.

Anyway, I don't think there is much to report in your example, but I have no doubt that 50% - 70% of the posts on Bitcointalk are just people posting meaningless drivel in order to get paid for their signatures, or to increase their activity score (so they can get paid more for their drivel).

One thing that many people do is to ignore anyone that is a member of a signature campaign. It really reduces the number of stupid posts that you would otherwise have to endure.