plz help, all of a sudden i just realized that my forum had double of the amount of members i had lastnite,when i realized it, i saw the same ip registering multiple accounts. i have deleted them.now how do i block them completely? because i have blocked them by banning the ip, but then they can still view my forum as guests.How can i ban them completely from even been able to see the forum at all. its a smf forum.plz help. i have google adsense, i dont want then to cause click bombs for me which may eventually lead to my adsense account bin closed.plz urgent help!

Ask Seun how he does his oh! i think he is doing a good job. forum spammers are terrible. they attack forums and spam like say tomorow no dey

What version of smf or/forum script are you using ?
There are numerous anti spam mods that can stop that.
You can also configure your custom anti spam through SMF 2.0 Security features.