Just checking through the stats hell lot of forum spiders User Agent BoardPulse (ISSpider-3.0; http://www.blogpulse.com; compatible; MSIE 6.0) Code (markup): Is it normal to be charged for impression for these ?
If a spider spoofs as being an end user like they do (pretending to be Internet Explorer), it could happen. Either way, the spider has been permanently blocked from our servers and you have received a credit adjustment that credits back everything they caused.
It's pretty rare... we have all known spiders locked down. That just is an obscure one that was spoofing as a valid browser.