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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.

Which leads me to check the weather, my schedule for the day, and then Facebook.

From The Wall Street Journal • Apr. 12, 2026

Swalwell said in a video message on Facebook that he wanted the public to hear directly from him and again denied the allegations.

From BBC • Apr. 11, 2026

Lai said in a Facebook post on Friday that "China's... military threats in and around the Taiwan Strait and the island chain have severely undermined regional peace and stability".

From Barron's • Apr. 10, 2026

Those essentially found the Facebook and Instagram parent legally responsible for harms done by content posted to its platforms.

From The Wall Street Journal • Apr. 10, 2026

“I’m texting a link to the Facebook group now.”

From "What If It's Us" by Becky Albertalli and Adam Silvera