What is BFF message on Facebook?

The “BFF” message on Facebook is an internet rumor that claimed if you type “BFF” in a post or comment and it turns green, your account is safe. People believed that if it stayed another color, the account was hacked. However, this is not true. “BFF” simply stands for “Best Friends Forever,” and the green animation was only a fun feature created by Facebook for certain words and reactions. It has nothing to do with account security or hacking. To keep your account safe, use a strong password, enable two-factor authentication, and avoid suspicious links or messages from unknown users online. 

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It is a viral message that is getting surfaced on Facebook asking users to type 'BFF' in the comment section to check if their account has been hacked.

This is actually a hoax and a majority of people getting duped. This hoax came after the news broke out that data company CambridgeAnalyticagained access to millions of Facebook users' data and allegedly used it to try to influence the 2016 US presidential race in favor of Donald Trump.

As per the message, if the term 'BFF' turned green, the account is safe, but if it remained black, the account was hacked. Some comments turned green due to a new Facebook update.

A BFF message is a private message sent on Facebook by friends to each other. They use these messages to show their feelings towards each other and to express emotions such as happiness, sadness, confusion and love. The term comes from their initials: Best Friends Forever.
The meanings of the messages vary depending on who sends them; they can be as simple as “I miss you” or they can say more like “you are my life!”
The best way to keep your friends happy is by showing them your appreciation through these messages, especially if you want them to reciprocate for you. It helps establish genuine relationships that will last for a long time and become a part of your normal conversations.