Someone threw it at me. Can I tell who it is?

I can't see it. According to the official customer service of Tik Tok, Tik Tok's "Shake Plus" is a paid promotion tool, and users can increase their video exposure and promotion effect by purchasing "Shake Plus". If someone else adds "jitter" to your video, you can't directly know who added it. Because the Tik Tok platform protects users' privacy, it will not reveal users' identity information.