The situation is made a little project for myself, which solved one of my problem. On reflection, I decided that the problem is not just me, and maybe someone need it, too. A bit of googling (as it turned out — poorly) and found similar service. In General decided to stick to a simple design and is open to the world...
But yesterday before going to sleep randomly (reading the q&a) found that there is already a project with similar functionality, and apparently quite successful in terms of number of users. After leaving the sorrow decided to think about it — do I need to continue to Refine their services or to score? Proper ways of monetizing virtually no. What to do — Refine and come up with some raisins or forget the project and think about the following?