Facebook's (NASDAQ: FB) news feed is getting bombarded with spam, BTIG analyst, Richard Greenfield said in March. In the video below, Fool contributor Daniel Sparks explains that Facebook will keep its news feed free of spam in order not to discourage members and, worst of all, convince them to head over to Google's currently ad-free Google+. Then he breaks out some evidence that shows Facebook could be displaying fewer ads than you think.