Nonsense. The vast majority of my Facebook friends post at least some original content.
https://news.gallup.com/poll/467792/social-media-users-incli...
U.S. adults commonly engage with popular social media platforms but are more inclined to browse content on those websites and apps than to post their own content to them. The vast majority of those who say they use these platforms have accounts with them, but less than half who have accounts -- and even smaller proportions of all U.S. adults -- post their own content.
https://www.pewresearch.org/internet/2019/04/24/sizing-up-tw...
Most users rarely tweet, but the most prolific 10% create 80% of tweets from adult U.S. users
https://www.pewresearch.org/internet/2021/11/15/the-behavior...
The analysis also reveals another familiar pattern on social media: that a relatively small share of highly active users produce the vast majority of content.