I've got a medical career site up and running and just had the realization that I'm finally in a niche that has related forums. All my other mini-niches didn't seem to have active forums so I wasn't able to get "backlinks for relevant forums" like they always talk about. Now that I do though, I need to hit multiple keywords and so I need multiple signatures on multiple accounts. How do I go about doing this? I have a VPN but is there something else that I should do in order to cover my tracks?