In other words, work on Quora problems for the privilege of working for free. Of course, there is the promise of being recognized, but no promises on being hired.
These aren't stuff we are looking to use ourselves. We're choosing these problems (which we have already solved in a more complex form ourselves) because we think it'll be interesting for others to try to apply their programming skills at "real world problems" that startups solve.
So my question is what problem did Quora solve? other than mostly copying idea (pardon: being inspired) by websites like Yahoo Ask, Hunch, etc.