Three cheers for Valleywag, for calling it like it is.  Comscore has been a scam for years, and now it’s downright committing blackmail.  Read the Valleywag piece for all the color, but the gist is that websites must pay Comscore $10k/mo in order to get accurately measured, and this is huge because ad buyers at all the big advertisers and agencies rely on Comscore stats (which I can vouch for from personal experience.)  Yay Valleywag, boo Comscore.