<A target="_blank" href="http://www.computerworld.com/s/article/9221360/Google_to_let_users_see_the_Why_behind_Gmail_search_ads?source=rss_latest_content&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+computerworld%2Fnews%2Ffeed+%28Latest+from+Computerworld%29">If you've ever wondered why some ads show up for you and not your friend,</A> Google is ready to offer some explanations. They'll even let you block adds from specific firms.