I'd just post it wherever you already have some credibility (like HN -- it's not a bad place to launch something). If you really do grow exponentially no one wi

I'd just post it wherever you already have some credibility (like HN -- it's not a bad place to launch something). If you really do grow exponentially no one will care what the starting seed was. As long as the exponent is greater than one, of course. :) Ok -- so after all that you really do want publicity but you don't have money. That takes time. Maybe set up a month-long private beta and invite the 500 most influential people you can find contact info for. It'll be good for you (small base of demanding users) and good for them (interesting story).