I'm seeing very weird behaviour in relation to this domain and a tracking image. On a specific page on our site, I'm seeing a script that's being added dynamically, apparently via flash (I wasn't even aware that flash could alter the DOM ...) That script is located at:

http://scorecardresearch.com/beacon.js

When I request that URL, I see a 1x1 gif. Another weird point is that this domain appears to break all the web-based whois tools; entering that domain results in a 1x1 gif. This is even to the extent where, if I enter scorecardresearch.com into the Title as part of this question, GIF code appears just below it! Hence, the "dot" in the title.

The only 'unusual' thing on the page is a slideshare 'widget', which is flash-based - that's why I'm concluding that flash is altering the DOM.

Anyone know what is going on here? How concerned should I be?