As much as I love OCW (I've "done" several courses there, including problem sets, exams etc), I think the problem of not being able to interact with an expert i

As much as I love OCW (I've "done" several courses there, including problem sets, exams etc), I think the problem of not being able to interact with an expert is still a very big limitation. For example, suppose I'm studying mathematics. I miss being able to show a proof to someone to get feedback on it. Sure, I know if I succeeded in proving what I set out to prove, but is there a better way I could have proved the same thing? It's like if I learned to code, and had unit tests to check correctness, but did not have anyone to critique my code style. Maybe I'm passing all the tests but my code is ugly and could be made a lot better? This may not be a problem in all courses, but it certainly is starting to be a problem in the higher level mathematical courses that I'm learning. OCW is fantastic, and I hope a companion site comes up where a student can ask questions to experts (even on "simple topics" and homework problems -- which rules out MathOverflow).