Charli, this is the one where I spend the majority of my BB time, but I do read and post on others.
One is a HORSE ONLY board, and God help you if you post anything remotely not horse related. The Mods will close the thread faster than you can blink.
I also read and post on boards that aren't related to horses in the slightest. I do have other interests, although horses are my biggest obsession.