I tend to drop blocks of ip netks on the perimeter before it hits the load balancer/firewall. It's possible to block all the Indian ISP netks for instance but depends what business your in.
Today's spammer joined on 21st November and left it until today to dump his st here. Early hours of the morning so fewer mods about to deal with it too.
This might not be the right place to discuss it, but why,? What are they hoping to achieve as surely no one clicks on these, or is it to try and slow the site?