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Facebook

[feys-boo k] /ˈfeɪsˌbʊk/
Trademark.
1.
the name of a social-networking service and website, launched in 2004.
verb (used with object)
2.
to communicate with (a person) or search for information about (a person) by using Facebook: My old boyfriend just Facebooked me.
His future employer Facebooked him and decided to withdraw the job offer.
3.
to post on Facebook: I facebooked some photos of my cat.
You should Facebook the event so more people will show up.
verb (used without object)
4.
to use Facebook:
Does your mom Facebook?
Also, facebook for defs 2–4.
Origin
1980-1985
1980-85; facebook, college student directory with personal photos and basic information
Usage note
The official trademarked name of the social-networking service and website is spelled “facebook,” all lowercase letters. Formal writing style—as exemplified by most news and book publishers—is to treat such names as regular proper nouns, in this case “Facebook,” using an initial capital letter. However, when a trade name begins with a lowercase letter followed by an uppercase one, such as eBay or iPad, this spelling is retained, even at the beginning of a sentence.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for face book

Facebook

/ˈfeɪsˌbʊk/
noun trademark
1.
a popular social networking website
verb
2.
(transitive; sometimes not capital) to search for (a person's profile) on the Facebook website
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for face book

facebook

n.

directory listing names and headshots, by 1983, originally U.S. college students, from face (n.) + book. The social networking Web site dates from 2004.

Online Etymology Dictionary, © 2010 Douglas Harper
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9
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