In OAAD, there's an example for the entry moderator:
moderators of online discussion groups
But I've seen the preposition for used in that context by native speakers too. Are they both correct? Or does it have something to do with different dialects?
Searching Google yields the following result:
- Moderator for: About 1,980,000 results
- Moderator of: About 6,000,000 results
So, the preposition of is more common. Is that the only difference?