The acronym "fff" can mean different things. But in
social media, fff stands for "follow for follow". "Follow for Follow" means that two
people follow each other. For example, if someone starts following someone, s/he
may ask the other person to do "fff". fff is generally used for social media users to gain more followers/supporters.
"fff" mean follow for follow.
Hey, I
love your Instagram
profile! Would you like to do a fff?
Let's do a fff so that we can gain more followers.
Sorry, I don't
accept fff.