Facebook founder Mark Zuckerberg is known for setting random personal challenges for himself and successfully completing them. Last year, for example, he pledged to master Mandarine Chinese.

This year, the 27-year-old CEO has one-upped himself by vowing to only consume meat in which he's killed himself.

"I'm eating a lot healthier foods and I've learned a lot about sustainable farming and raising animals," notes the Internet billionaire. Earlier this month, he shared with fellow Facebook friends that he killed a pig and goat, leading to an onslaught of mixed emotions.

After killing the animals, Zuckerberg sends them to a butcher who then returns all of the sliced and diced animal parts, including the innards.

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