CNET Networks Inc. says it is laying off 120 employees as part of an effort to streamline the online media company, according to The Associated Press. All the layoffs--about 4.4 percent of CNET's workforce--will involve employees in the U.S., according to a document CNET filed Wednesday with the Securities and Exchange Commission. Along with the technology news site CNET.com, the San Francisco-based company operates News.com, TV.com, GameSpot.com, Chow.com and BNet.com.--Tanya Irwin