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Definition of Facebook
1. Proper noun. A social-networking web site, founded in 2004 and originally known as ''The '''Facebook'''''. ¹
2. Verb. (intransitive) To use the social-networking site w:Facebook Facebook. ¹
3. Verb. (transitive) To send a message or leave a comment on Facebook. ¹
4. Noun. A reference book or electronic directory made up of individuals’ photographs and names. ¹
5. Noun. A college publication distributed at the start of the academic year by university administrations with the intention of helping students get to know each other better. ¹
6. Verb. (alternative form of Facebook#Verb Facebook) ¹
¹ Source: wiktionary.com