According to a photo on Facebook, if you go into any photo on your Facebook page, and type in the comments section “@[4:0]”, if it changes to Mark Zuckergerg it means your Fb account hasn’t been hacked.
See the full message here:
Not exactly. Whether or not this trick works on your account has nothing to do with the security of your account, hacking, or any other nefarious activities. The real explanation is actually pretty boring.
Every Facebook profile (and page) has a unique ID. The code “@[4:0] is actually shorthand code, that tells Facebook to produce the name of the Fb profile associated with the ID number 4. So, typing in “@[837489:0] would produce the name of the Fb profile associated with the number 837489. Although most Fb accounts created today would have ID numbers in the millions, Mark Zuckerberg (the founder of Facebook) has an account associated with the number 4.
For many people, typing in “@[4:0]” will work, and it will change as soon as you post. However, for others it doesn’t work. It has nothing to do with hackers, etc. It has more to do with the platform with which you access Facebook. On certain platforms (usually desktop), Fb automatically inserts a space between the @ and [ symbol when you post the comment, rendering the shorthand code useless, and nothing happens.
A similar ‘trick’ went viral a few years ago, stating that your cell phone has a name that can be discovered by typing in the last 3 digits of your phone number in place of the number ‘4’ in the code. This was, of course, not true.