“When you have nothing to do, do it on Facebook” is a jocular one-line Facebook saying that has been printed on images. The saying was popularized by a May 2008 cartoon.
   
“When you have nothing to say, say it on Twitter” is a related saying.
 
   
Wikipedia: Facebook
Facebook is an American for-profit corporation and an online social media and social networking service based in Menlo Park, California. The Facebook website was launched on February 4, 2004, by Mark Zuckerberg, along with fellow Harvard College students and roommates, Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes.
       
Geek and Poke CARTOONS
Just 2 More Slogans
WHEN YOU HAVE NOTHING TO DO, DO IT ON FACEBOOK (Cartoon.—ed.)
May 5, 2008 12:26:00 AM | Facebook
 
Twitter
Kay Butter‏
@KayButter
when you have nothing to do, do it on facebook ^^ http://tinyurl.com/6pbge8
2:01 AM - 5 May 2008
 
Twitter
Florian Wagner‏
@Tabasco75
bestimmt alt, aber gut: When you’ve got nothing to say, say it on Twitter!
When you’ve got nothing to do, do it on Facebook!
5:12 AM - 5 May 2008
 
Twitter
Guillaume‏
@Ricardolux
Citation du jour “When You have nothing to do, do it on FaceBook” :D
11:50 AM - 13 May 2008
 
Kelbell8’s Blog
If You Have Nothing To Do, Do It On Facebook!
October 9, 2009 at 4:49 am
If there’s one realization that nearly every MCOM101 student made from blog number one, it’s that people are addicted to media.
 
Catch Quotes
A collection of 26 funny facebook quotes and sayings for status with images
admin September 30, 2016
(...)
16. “When you have nothing to do, do it on Facebook!”
 
Twitter
Susil Basnet‏
@Sco_Susil
When you have nothing to do,
Do it on Facebook!😂😜
Status: Facebook
10:33 AM - 18 Jan 2017