Startup Idea : HelpMe

I was thinking of this idea by going a lot through quora and seeing how helpful it has been to a lot of people in many ways. However I noticed how unorganized the website was and how questions were put out there for anyone to answer. I was thinking of an easy and simple Iphone application where anyone could easily ask a question based on location. For example someone who first arrived in New York could easily at the airport use the app and ask for the best restaurants in town and people from the app would answer the person. Further on, I was thinking how we could arrange the questions by category so that anyone wanting to ask a question or answer a question could directly filter it and easily find it. No profiles would be required on the app and it would offer you service 24 hours since someone would always be up. Also, the question of course would delete itself after a certain period of time (24 hours) wether it has received an answer or not.