Don't bother PM'ing the spammer. It's a bot. PM'ing won't break the thing and they use throwaway email addresses. If we don't have a mod watching to catch these ####s then they will post up to 100 threads before starting a new id. When we ban an id, sometimes they come right back with a new id, but most often they wait for an hour or more before trying again. If you can make free international voice over ip calls please feel free to knock yourself out calling the number and jerking their chain.
If you would like to volunteer to get privs to be able to cause posts to get automatically moderated when you use the report capability, please PM me. Frankly, it's a thankless job and an even more tedious way to deal with this problem than what the mod team is doing. We're getting pretty good at catching these within an hour or two of posting, Flagging the posts and hiding them does not stop new ones from appearing and does not reduce the workload we do to deal with this attack.
The random number thing is called CAPTCHA. We're supposed to have that stopping spammers at registration time, but spammers are getting to the point where one has to make it really annoying to real people to be good enough to beat them. These Indians are using the Facebook registration method and either using throwaway Facebook accounts or names that are so common we can't figure out which account was used.
As I've said, there is no shortage of good ideas for how to beat this attack. Unfortunately our vendor does not have a significant enough financial incentive to take timely and effective action.