When we type “BFF” in Facebook comment box, the letter BFF appears green and we can see an animation, This is called Facebook’s text delighted animations. Some text delighted animation words are congrats, happy birthday, etc.
The below messages are hoax.
“Mark Zuckerberg, CEO of Facebook, invented the word BFF. To make sure your account is safe on Facebook, type BFF in a comment. If it appears green, your account is protected. If it does not appear green, change your password immediately because it will be hacked.”
“Mark Zuckerberg Facebook inventor Make sure you do not think about your page or account Type Bff in a comment If it appears green, your account is protected and if it appears normal, you must change the password. Try it”