I can't deny the fact that social networks are a great way to keep in touch with friends and family, but when I hear about stories like this, I get worried about online privacy and security. Facebook has recently introduced a marketing program that publicizes users purchases in their "Mini-Feed" for all their friends to see—movies, clothes, household goods, you name it. Silicon Valley News reports that this new marking initiative allows companies to tap ongoing Facebook conversations by alerting users about friends' activities through the feeds. Forty websites have already embedded this tool from Facebook, known as a Beacon, to enable the marketing feeds. An area in their web browser is said to give them the option of checking a small box that says "No Thanks" to sharing their purchasing info, which many have reported not even noticing. When Mike, a Facebook user recently purchased movie tickets on Fandango and a video game on Gamefly for his son for Christmas, he had no idea that both transactions would pop up in his Facebook Mini-Feed for all of his contacts to see—no warning, no red flashing lights and no notification (well just to your five hundred friends). Kinda takes the fun out of online shopping. To learn more, check out Mike's full story. What do you think about all this? Excuse me while I go disable my Facebook Mini-Feed!