(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. 30 May 2019. <https://www.yourdictionary.com/u2u>.
U2U. (n.d.). Retrieved May 30th, 2019, from https://www.yourdictionary.com/u2u
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