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.
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)
to use Facebook: Does your mom Facebook?
Also, face·book for defs 2–4.
Origin: 1980–85;facebook, college student directory with personal photos and basic information
Usage note The official trademarked name of the social-networking service and Web site 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.