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Facebook

American  
[feys-book] / ˈfeɪsˌbʊk /
Also facebook
Trademark.
  1. a brand name for a social media service and website, launched in 2004.


verb (used with object)

  1. to communicate with (a person) or search for information about (a person) by using Facebook.

    My old girlfriend just facebooked me.

    His future employer Facebooked him and decided to withdraw the job offer.

  2. 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)

  1. to use Facebook.

    Does your mom Facebook?

Facebook British  
/ ˈfeɪsˌbʊk /

noun

  1. a popular social networking 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

verb

  1. (tr; 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

Spelling

The official trademarked name of the social media platform and website is now styled in all capital letters “FACEBOOK,” though prior to 2020 the trademarked style was “facebook,” in all lowercase letters. Formal writing—as exemplified by most news and book publishers—treats such names as regular proper nouns, in this case “Facebook,” using an initial capital letter, but not all caps. 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.

Etymology

Origin of Facebook

First recorded in 2000–05; from facebook, a college student directory with personal photos and basic information

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The company used social media to recruit workers and target patients, with online advertisements on Facebook, parents and former employees said.

From The Wall Street Journal • Jun. 2, 2026

On Monday, Sulyok announced several military appointments via Facebook.

From BBC • Jun. 1, 2026

Another Moneyist Facebook Group member, who once worked as an insurance adviser, said he once sold a strong LTC policy to a healthy client in her 70s.

From MarketWatch • Jun. 1, 2026

By Saturday evening, a total of nearly 200 search and rescue personnel had joined in the search operation, according to a post on the department’s Facebook page.

From Los Angeles Times • May 31, 2026

“We’re thinking a private Facebook group,” Moss said.

From "Anger Is a Gift" by Mark Oshiro

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