I'm not so sure she'll find the answer to the question she's asking, so easily, Frumpy. Even if it is posted somewhere else, I think I'd rather answer this one again to make sure the word gets out faster.
Dating site administrators and moderators can see the IP address of members as they join and access their site. African and Russian IP ranges are easily blocked and there are lists of them posted around the net. Likewise there are lists of bad proxy servers that the scammers and spammers use. Those should be blocked as well. I believe site administrators can contact Wayne here, who can also provide that list of IP's (if he's in an agreeable mood
Also, site admin near and dear to my heart accept and seriously investigate member reports. If your dating site trusts your judgment and boots the slimy little maggots, that's great.