Have you ever seen articles about how hackers stole data from Facebook using external applications?

How can these applications steal data from users? Well, when you access an application, such as a social network, you just enter your credentials once; after that, the applications create identifications, such as sessions, to track the users. These sessions and other data need to be stored somewhere, and usually, the best place to store them is in cookies.

Cookies are files in your computer that are stored temporarily so that they can be accessed by applications. This means that you do not need to enter your username and password each time you access Facebook, you just need to do it once, and then when you access Facebook, Facebook will ask to your browser for a cookie; if the browser has it, Facebook reads the session stored in the cookie, and automatically enters your account. Great!

You can access the cookie's information directly in your web browser,...