Yahoo wants to prove the influence by comparing different ads in similar demographics, and comparing data from a server address, a zip code, and credit card info from a purchase.

FORBES: Yahoo, Kardashian & the Spectrum of Engagement

And the day before her seminar, as time ran out, she posted no less than 70 ads on Craigslist with headlines ranging from "How to be a Rich and Happy Server" to "Complimentary Sangria!"

WSJ: Tips for Waiters

The episode spotlights the controversial subject of online profiling, whereby Internet ad server companies, such as DoubleClick and Engage, track Web surfers in order to strategically target banner ads and site content, as well as to help sites keep a running count of visitors.

CNN: U.S. antidrug site dealing cookies