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Facebook didn't invent any code generator abbreviation such as "BFF". Abbreviations such as "BFF", lmao", "rad" etc were invented back in 2017. These are all celebration animations. "BFF" stands for Best friends forever. And in the same way all the abbreviations have their own meanings. The abbreviations in comments turn colorful because it creates animations on the screen. Facebook doesn't need any code generator words, abbreviations in order to check the privacy of any account. They can check all the things on their servers. So ladies! and gentlemen don't be in any wrong hype. The below article gives in detailed overview about these abbreviations.
https://www.google.com/amp/s/mashable.com/2017/10/23/facebook-words-hidden-animations.amp
