If you can solve this problem then you have solved entrepreneurship. Really you need to start to promote the project (as you have done here) and start to gather traffic to your site, while it has a minimal feature set. If you over-engineer and over-develop to get it "perfect" you'll just waste time that could be spent on another idea. Launch the most basic version and get links going to it from blogs, facebook groups (etc) and other established websites.

Even if you publish the best and most useful app in the universe, if nobody knows it exists then does it really exist?