Ever find yourself scrolling through a website and seeing an advertisement that’s a little too well-targeted? You know, as if the advertiser knew you recently twisted your ankle and need to buy some sturdier shoes? Columbia University researchers are working on XRay, a tool to help innocent Internet users make sense of those ads that stalk us, sometimes in ways that are worse than creepy.Climbing In Your Inbox, Snatching Your Searches UpAs most people know by now, your personal data is the price you pay for "free" services such as Facebook and Google.