I've been putting all of my farming stuff in my blog. As MiRai mentioned sometimes people ask what to do or where to farm and in that case I'll have the info ready to post.

If you notice many of the farming threads they start out saying one thing, but with how quickly Blizzard fixes bugs and tunes things the threads quickly change and grow where the first posts are no longer correct. An example is the Legion Invasion thread for farming experience, they nerfed and buffed the invasions so much.

I don't know if thats in favor of a sub-forum or not but in a blog like setting it works as older posts gets hidden and newer posts stand out.