Facebook defends against claims that advertising on the site doesn't work(online.wsj.com)
online.wsj.com
Facebook defends against claims that advertising on the site doesn't work
http://online.wsj.com/article/SB10001424052702303768104577462393468083290.html?mod=WSJ_hpp_LEFTTopStories
For example, comScore tracked people who were Starbucks fans on Facebook against a control group of people who weren't exposed to those messages. ComScore found that over a four-week period, fans and their friends bought 38% more frequently at Starbucks than people who weren't exposed to the Facebook marketing."