Kourtney Kardashian and Lizzo are among the stars who expressed anger before TikTok briefly shut down in the U.S. on Sunday.
Celebrities and influencers across the U.S. mourned the shutdown of the app after the Supreme Court upheld a bill that would've effectively banned the app over national security concerns due to its Chinese ownership.
Although TikTok briefly went down overnight on Sunday, it swiftly returned on many devices with a message "thanking" incoming U.S. President Donald Trump for "clarity" in providing "assurances" TikTok's service providers would not face penalties related to the ban.
Trump had previously indicated on his Truth Social platform that this would be the case.
Before the brief shutdown Kourtney shared a highlight reel of her best moments and said: "If this is goodbye, we love you TikTok."
Lizzo hit out at the government decision but seemed optimistic that the app "would be saved".
She told her TikTok followers: "I know all the things that are going on, but you know how mentally abusive people like to say stuff to scare you and make you feel scarcity and they get some sort of sick, twisted satisfaction of it?
"Don't you think that the government likes seeing us stressed and scared and fearful? It really feels like it. So no, I'm choosing to not be fearful right now. I am not afraid."
Others critical of the ban included Chrissy Teigen, who claimed the move to 'ban' the app was set up so Trump could act as if he was saving it.
The incoming President indicated he was planning to delay the TikTok ban but would require the app be sold, mooting "a joint venture between the current owners and/or new owners whereby the U.S. gets a 50 percent ownership".