IshmaelF

People really like email/pass, the more lazy ones use facebook and other social. SMS costs money and I don't see the advantage of it.

I believe there will always be a demand for problem solving, especially in the technical industry.

- A: Large scale businesses would benefit greatly on this idea. An idea where a company can save money is always a good idea.

- B: This idea could work, but I can't see it going far.

-C: This is actually something that could hit the world. One thing people like is winning and if they can get some type of physical reward out of it, they would definitely use it.

Firstly, since it is a hobby, tell a few friends about it -- see if they would get on your application, get some feedback from them and move on accordingly.