I like this concept. I'd provide a few more examples than "farmers market" on the front page. Get a "How it Works" page going, too.
Creating an account (after signing in with twitter) felt sketchy. Password displayed in plaintext, typos "genrated", bad punctuation / capitalization in the headers, and an error on http://thrdplace.com/signin_signup/index.php?route=users/com... -
Warning: Cannot modify header information - headers already sent by (output started at /homepages/34/d394755760/htdocs/signin_signup/application/views/users/complete_registration.html:12) in /homepages/34/d394755760/htdocs/signin_signup/index.php on line 29
