I'm launching a new Q&A community and was wondering how specific a market I should target while seeding and promoting the site in its early stages.
If the ultimate goal is for it to become the best Q&A community for consumer technology enthusiasts, for example, would it be worth starting off by JUST targeting iPhone aficionados, while assuming that there was enough of a commonality to make it easy to get Xbox 360 users and home audio geeks onboard down the line? Or is it best to begin seeding with everyone whom you hope to eventually come on the site, since there is a risk that by not doing so you may end up "niching yourself out"?
I know that I will need to take account of the degree of overlapping interests of these different sub-segments, but I was wondering if there were any hard and fast rules that could be applied aside from that consideration?