Follow Friday is when, on a Friday, people show each other some Twitter love, by recommending to their followers who they recommend to follow. It was invented by Twitter users. And it’s usually preceded by the hash sign – as in #FF or #FollowFriday. So, it’s actually a hashtag, used on Fridays!
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A note about hashtags, while I am at it

When you put a hash sign next to a word on Twitter, it becomes clickable. Any spaces or punctuation marks will “break” the hashtag and it will be just the word before the hyphen or apostrophe or space which is clickable.
Why Friday?
I can only guess this, it’s a nice end of the week thing to do. Friday is a more relaxed day. People have Pizza Friday and Beer Friday, there are songs written about Friday, it all kind of goes with that Friday feeling.

Typically there are three ways to do it.

A group Follow Friday:
This is when you group together a list of people you think people should follow. It’s a group love tweet!

#FF @houston_foodie, @topleftdesign @itsallaboutde @karmacrisis @melissatweets @alisonjardine @sheilakathleen @diversionbooks @carachan1
— Cara Ellison (@caraellison) June 7, 2013

A specific person Follow Friday – with a reason

Where you recommend one person to follow, for a special reason. Many folk recommend this version as it’s more personal.

#FF @tamhall for another fantastic design sign off, being DJ for the first time today, and changing #beeroclock to start an hour earlier!
— Keren Lerner (@topleftdesign) August 10, 2012

Big thanks and #FF to @dejsurlherbe for lovely LinkedIn recommendation https://t.co/G3oHrDTH *blushing”
— Keren Lerner (@topleftdesign) December 14, 2012

A group Follow Friday – with a reason for all

#ff @topleftdesign @tinawebster @tamhall @tremulantdesign @funsella @kevinplattret who regularly put up with our moody admin guff 🙂
— Alan Ogden (@alanogden) March 2, 2012

#ff some fabulous folks: @topleftdesign @mariaveletas @elenicurious @fiumanofineart @f_dragonfly @keiththegraham – all fab collaborators!
— Susan J Mumford (@susanartdealer) March 1, 2013

#FF @houston_foodie, @topleftdesign @itsallaboutde @karmacrisis @melissatweets @alisonjardine @sheilakathleen @diversionbooks @carachan1
— Tamsin Fox-Davies (@tamsinfd) April 26, 2013

Your reaction to #FF

Another thing that happens is when people are #FFd, it’s polite to say thank you! You can also

1. Follow the other people in the group you were mentioned in
2. Tweet back and say something about how you are pleased to be included
3. Tweet back and say you have followed the other people

@caraellison did I thank you for the #FF? #abitlate #thanks
— Keren Lerner (@topleftdesign) June 11, 2013

Hope that helped you understand all about the #FF trend on Twitter!
You can learn more about how it all started on Mashable’s post #FollowFriday: The Anatomy of a Twitter Trend