It's both less and more specific than that. Subreddits are ideal (or at least best-yet) implementations echo chambers. A particular idiosyncratic groupthink eme

It's both less and more specific than that. Subreddits are ideal (or at least best-yet) implementations echo chambers. A particular idiosyncratic groupthink emerges for each subreddit, and the platform then filters incoming communications according to it. Because it's gamified, people are actively competing to conform to the local cultures. And here we are, where some guy believes that rekindling a prior conversation with a friend or acquaintance is psychotic.