I'm planning to outsource forum based link building to India. Should I have the provider go through a US proxy to favor websites in the US? I know that geographic location is a factor in SERP page selection, but I'm not sure if the country of the linking website is relevant or not. I'm only interested in US traffic.
You dont need a proxy for them to comment, just make sure they are commenting on US based websites. These links will help the SE categorize you geographically.
I was thinking of having the proxy more for finding forums in the right geographical area than once they get to the forum.