CNET's odd mathKara Swisher's new pet media blogger Peter Kafka praises CBS executive Quincy Smith, shown here, for picking up CNET. Revenues were up 6 percent in the most recent quarter, with a 12 percent increase in display advertising. But wait a second: Aren't display ads most of CNET's revenue? The company also makes money through e-commerce referrals and the sale of marketing data — which suggests something went wrong enough in CNET's other businesses to blunt the welcome rise in advertising.