All good point so far. I agree with trying different messaging to see if something resonates with your audience more. In my experience, modeling the behavior and building a culture of accepting solutions has been important. After the initial window has passed for the OP to accept the solution, having internal subject matter experts validate replies and mark them as solutions helps community members see "this is something we do here" and hopefully encourages them to do so as well. Obviously, you have to be careful about the overhead of this activity and make sure that the solutions really are solutions.
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