Tik Tok is Chinese, though. Is there a US version out?
Yes. Facebook just launched one :)
Tiktok bought their way to their current position. I bet most of the "best tiktoks" accounts on Facebook/Twitter are owned by themselves. In a matter of months they will die off naturally.
It does seem very artificial. A very boring/obnoxious app that went from nothing to being pushed at me from everywhere.