LatestDude !!nEftABMoF joined in and replied with this 15 years ago, 1 minute later[^][v]#268,854
I isn't short for anything - it's the proper pronoun. "U" is just a mangled form of the proper pronoun, you. Thanks to how linguistics works, however, if you'd like U to become acceptable, you just have to use it constantly and convince most other people to do the same.
Anonymous A (OP) replied with this 15 years ago, 57 seconds later, 2 minutes after the original post[^][v]#268,857
@previous (LatestDude !!nEftABMoF)
It's already used widespread informally. What English is in desperate need of is a logical reformation.
Anonymous C joined in and replied with this 15 years ago, 1 minute later, 3 minutes after the original post[^][v]#268,859