https://telegram.org/blog/supergroups5k
Supergroups 5000: Public Groups, Pinned Posts
Supergroups 2.0: up to 5,000 members, pinned messages, public groups and new moderation tools.
public groupspinned postssupergroups
https://www.socialmediatoday.com/news/x-pinned-posts-to-all-of-your-followers-in-the-app/709001/
X Will Soon Show Your Pinned Posts to All of Your Followers in the App | Social Media Today
X is adding another amplification option, though the risks for X seem significant.