(1) "Up to you." See digispeak.
(2) (User to User) Communications from one end user to another. Telephone calls and video calling are two forms of U2U. See X2X.
"U2U." YourDictionary, n.d. Web. 15 November 2018. <https://www.yourdictionary.com/u2u>.
U2U. (n.d.). Retrieved November 15th, 2018, from https://www.yourdictionary.com/u2u
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