You're right. It's a tracking code. .
ScorecardResearch collects data through from two main sources: surveys and web tagging. For our surveys, we invite people on the Internet to provide us with anonymous demographic and Internet usage information that we can use to refine our reporting. These surveys are always voluntary, and are never used to collect personal information. For web tagging, participating websites agree to deploy a special code throughout their sites. Again, no personally identifiable information is ever transmitted by, or linked to, the web tags.
<blockquote. Most WordPress.com sites got this script .
WordPress.com Staff may want this on their official blog but I don't recall the rest of us bloggers ever being asked if we wished to participate or not. Did you contact Staff about this or not? If you did then I would appreciate you returning to this thread and posting their response into it.