Seems like a little bit of a strawman, they're all bad.
My argument is that the regime that is carrying out the genocide is in control of the algorithms for a major social media company.
You perfectly prove my point when you have no problem realizing the impact on Americans control of a social media has in the case of Twitter, but are completely blind to the impact of TikTok.
Americans aren't oblivious to the genocide of the Uyghurs due to TikTok, they were oblivious before too. On the whole there's no impact on our daily lives from their plight, and as long as that's true it's going to continue having no bearing.
YouTube has radicalized people to jihadi terrorism and white supremacy, Facebook has promoted Rohingya genocide, Instagram is seemingly having a negative impact on depression and suicide amongst teenage girls... these are all problematic platforms regardless of regime... and that's before you get into more of the state-sponsored nonsense that the CIA and other do to spy on everyone regardless of which country they reside in.