I don't think we're TOO strict on that sort of thing... you could make two threads, on in CPUs and the other in Motherboard, or one in Desktop Computers, or one in General Computer Chat. Where ever you post, I'm sure you'll get replies.
just post in motherboards and ask what processors would be compatible with that processor, or if you have a specific processor in mind but not a motherboard then post in CPUs and ask for the best motherboard for that processor socket, e.g what is the best 775 montherboard