There has even been serious research done in this field on post graduate level.

I have my own years spent as an admin to draw from. To actually trust the community is one of the most effective ways to engage people in it. When you know that what you think counts, you tend to use your, albeit limited, power with care but not hesitate to actually act when you think you should.

Assuming that the people on the other side of the keyboards are mostly intelligent and constructive people goes a long way.