Facebook has revealed it's 40 most shared stories of 2011 in a recent blog post.
Representatives for the social network said:
"The stories range from cute to thought provoking and represent the type of news people have been sharing and discovering with friends in 2011."
So why not relive some of the most talked-about events of last year and check out our run-down of the most-shared posts now...
Tools designed to ensure computer code in smart cars does not crash has been inspired by hungry penguins.
The rounded sleeping capsules send guests drifting into ocean before arriving on desert island by morning.
Sitting on the saddle activates the part of the brain responsible for learning, a study has claimed.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
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