For the last 18 months or so I've been a semi-official (along with others) on an insect site in France. It is also bombarded by spam (most of which get kicked out before they post a comment), but all new members have to wait until one of the team confirms their first post before it goes "public". Usually only a few minutes to an hour, but it works well. Anyone who is genuine doesn't mind an initial wait.
Best wishes
Hazel in the Gironde estuary, France