Most likely, you have used such a common function as authorization via social media, leaving a comment or creating a personal account on any website. In this case, you have simply given an Internet pages a permission to use your social media authorization data not to waste time inputting your name, age and password. This is convenient, not too secure, but sometimes it can be used, of course, if you completely trust the website which you log in.
But a few people are in the know that a few years ago, a developer Robin Linus demonstrated on his GitHub Pages how visited Internet pages get “a social media fingerprint”. This mechanism determines in which popular platforms users are logged, without any authorization on the visited page. Moreover, the administrator of any site you visit can get this information if he wants.
Simply put, social media fingerprint is a list of platforms and social media where you are logged via particular browser received by an Internet page. Websites generously share information about signed-in users with anyone. This data collection could be a step of a worse attack such as de-anonymization techniques, Clickjacking or Profilejacking.
Well, are you certain that you’re ready to share your data with a random site? If you not, it would be necessary to log out after use. But do we always remember where we are logged in and have we clicked the “Exit” button or not?