Yes, TikTok is very very popular for this. The network of these accounts is then leveraged by "fan accounts" who form hubs for abusers to connect with one anoth

Yes, TikTok is very very popular for this. The network of these accounts is then leveraged by "fan accounts" who form hubs for abusers to connect with one another and share links to other platforms, particularly Telegram and Mega. Reddit is also extremely bad for it. They have a system now where a new subreddit is created every day, discoverable via known keywords, and then used as a directory for links to telegram. The other thing you'll commonly see on both of these platforms is material being stolen from other social media platforms and then re-hosted to reddit or TikTok with sexualised descriptions. Reddit for example will often say it's fine as long they don't explicitly mention that the images are not of the poster.