World of Warcraft: one simple line of code can cost you dearly (2016)
It's funny that if you open developer tools in facebook.com, you get a nice message about not to copy things into the developer console.Stop!
t78-eatOBZQ.js:172 
This is a browser feature intended for developers. If someone told you to copy-paste something here to enable a Facebook feature or "hack" someone's account, it is a scam and will give them access to your Facebook account.
t78-eatOBZQ.js:172 
See https://www.facebook.com/selfxss for more information.