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1.
Searching your friends' old posts and liking them to make them embarrased of their old posts or just to troll them.

The act of going far back in the facebook post history of people you barely know and liking an inane status update to make them show up in the news feed.
"I just timelined my friend on facebook!"

"Let's go timelining!"
by partykivi November 09, 2012
 
2.
Using facebook to examine all the bad decisions you've made and how cool you really weren't in high school thus coming to the realization that your life is truly depressing, also because you obviously have time to dick around on facebook all day looking at your timeline.
I was timelining last night and noticed that 90% of the girls I dated are on xanax, pregnant or in jail, in no specific order.
by PorkCHOPsandwiches44 September 10, 2012
 
3.
To compose a timeline.
I was timelining chapter 2 for World History.
by Laura K August 29, 2005