I'm the founder of this site: http://www.snapplans.com. (It is up for demo purposes but not finished). I'm looking for a marketing-driven co-founder. If this is something that might interest you please contact me (my name is Barry) at bglenn09@gmail.com.
From a quick glance (sorry, I don't register for facebook apps) it seems to me you just need people using it in the same location.<p>The most sensible marketing idea to me is using it in your town. Get your friends to test it out, make plans on it, demo it anywhere you can. Find all the local people/groups in your area (meetup.com, facebook groups, craigslist, online dating sites, whatever else comes to mind?)<p>You need a critical mass in a given location for it to work (I hope you live somewhere crowded... not on a rural farm!). I say pick your own city because you may have an easier time connecting with people locally rather than cold emails/calls. Now is that time to spend any and all goodwill getting people to try it out.
Clickable:<p><a href="http://www.snapplans.com" rel="nofollow">http://www.snapplans.com</a><p>Edit: Added: <i>Fantastic</i> design coupled with <i>crystal clear</i> and flawless communication/copy on the home page. Are you <i>really</i> sure you need a marketing co-founder? ;-)
I didn't really understand what it was from the homepage. Is it for me to organise things with my friends, or is it like Meetup.com? I think you should also make it more clear it's USA only (The zip codes).
You should apply for Y Combinator, this is a slick product with a well articulated message. I strongly doubt you need a marketing co-founder - you need another hacker, and for you to learn more marketing stuff :)