https://www.vice.com/en_us/article/qvge3v/tiktok-the-app-without-time-is-testing-a-timestamp-feature

TikTok, an app for sharing 15 or 60-second videos, exists outside of time, as reported by Wired last week. Unlike Twitter, Facebook, or the roughly-analogous video platform Vine, users can’t tell exactly when videos were uploaded.

On one hand, as reported by Wired, the lack of a timestamp means that evergreen humor flourishes on the app. But also, this means news-of-the-day and time-sensitive content about protests doesn’t have much of a place on TikTok. The lack of timestamp also makes it easier for people to steal content from other users, as it can be hard to tell who actually published their content first.