Some TikTok users, including the comedian Megan Stalter, have accused the app of blocking them from posting videos about ICE or limiting the reach of those videos. State Senator Scott Wiener, Democrat of California, who is running for Congress, said on X that he had posted about legislation that would allow lawsuits against ICE agents. Mr. Wiener said the post was “sitting at zero views, and I’m not the only person this is happening to.”