Earlier this year, The Wall Street Journal caused a stir when it reported that some Facebook widgets had, for a time, obtained browsing data about users who had never
visited Facebook.com, though Facebook wouldn't know their identity. Facebook said it had discontinued that practice, which it described as a "bug."
As ZDNet explains, "The cookie was being set even if the user had never been to the Facebook site, and even if he or she didn't click on a given Facebook widget." Cubrilovic says the datr cookie is now back, and, again, is being "set by all the third-party sites that we tested." No word yet from Facebook on these accusations.