Well, this is terrifying. From Vice:

Tim Libert, a researcher at the University of Pennsylvania, has discovered that the vast majority of health sites, from the for-profit WebMD.com to the government-run CDC.gov, are loaded with tracking elements that are sending records of your health inquiries to the likes of web giants like Google, Facebook, and Pinterest, and data brokers like Experian and Acxiom.

From there, it becomes relatively easy for the companies receiving the requests, many of which are collecting other kinds of data (in cookies, say) about your browsing as well, to identify you and your illness. That URL, or URI, which very clearly contains the disease being searched for, is broadcast to Google, Twitter, and Facebook, along with your computer’s IP address and other identifying information.

It seems like every day I see a new article showcasing what little privacy we really have.