Modern social media usage is definitely not private. People do stuff to be seen and both Instagram and TikTok exploit users wanting to go viral. For Facebook,

Modern social media usage is definitely not private. People do stuff to be seen and both Instagram and TikTok exploit users wanting to go viral. For Facebook, it was only private in the sense that the greater general public couldn't see your content, but that's really just unrelated third parties and Google. The stuff you post on Facebook was effectively public in the people around you could all see it.