Facebook tracking
Facebook enables your web browsing to be tracked even if you're not signed in or signed up to the service. It does this by use of its invisible Pixel solution as well as through a variety of other mechanisms, including the Like button. We're only mentioning this because, in his testimony on Capitol Hill, Mark Zuckerberg seemed pretty hazy on the details. And that's despite February's ruling by a Belgian court that ordered Facebook to stop tracking people on third-party sites and delete any data it had gathered. His performance on the issue reflected the general tenor of his testimony; in case of controversy, avoid saying anything substantive. It was a strategy that clearly worked for investors. By the end of 2 days of saying very little, the value of his personal Facebook shares had risen by nearly $4 billion.