I couldn't find the list on my first skim. Then found in the footnotes, in case anyone is curious:

"2 “Social-media companies” include Facebook/Meta, Twitter, YouTube/Google, WhatsApp, Instagram, WeChat, TikTok, Sina Weibo, QQ, Telegram, Snapchat, Kuaishou, Qzone, Pinterest, Reddit, LinkedIn, Quora, Discord, Twitch, Tumblr, Mastodon, and like companies"