I have a project that was started last year. We tried for YC but didn't make it. My team got burned out and now it's stopped. Our mission was to make mobile advertising more effective and connect the advertisers with the audiences. The advertisers can target their campaign at specific demographic audience. The ads are full screen and there's a mechanism for the advertisers to "interact" with the audience. Also, we bring mobile advertising to SMB that do not have the skill or resource to get into the mobile space. I'd be happy to go into more detail if you are interested.