Follow Friday is a fun Twitter tradition of giving props to people you follow and recommending them to your followers. You can participate in Follow Friday at any time on Friday and can send multiple tweets recommending great people to follow if you can't fit them all into 140 characters.
You can also recommend profiles as well as people, so feel free to recommend @TheOnion to everyone.
How do I recommend people on Follow Friday?
To recommend a Twitter profile to your followers, simply start out your tweet using the "#ff" hashtag followed by a list of accounts you think would be great to follow. For example:
"#ff @DanielNations @Scobleizer @ContestsGuide @TechCrunch"
Find the definitions to more terms in the Twitter Glossary.