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English definition of “Facebook”

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Facebook

noun uk   /ˈfeɪs.bʊk/ trademark us  
a website where you can show information about yourself, and communicate with groups of friends

Facebook

verb uk ( also facebook)   /ˈfeɪs.bʊk/ us  
[T] to send someone a message on Facebook: I facebooked him and he told me where he lived on campus. [T] to publish information on Facebook: Can you facebook me the picture? [I] to spend time using Facebook
(Definition of Facebook from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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