From your link: Wikipedia develops at a rate of over 1.8 edits per second
The statistics I can find for Reddit put it at 160 submissions per second[0]. And that's not counting comments or votes. And each vote changes the ordering of submissions and comments.
Or 'hide', in every sub I'm active in I hide each new thread after I've decided I am not interested or after I've looked at it so I can quickly scan new stuff.
Then add automoderator removing things for manual approval, approval of threads etc. Gilding, messages, chat etc.
The statistics I can find for Reddit put it at 160 submissions per second[0]. And that's not counting comments or votes. And each vote changes the ordering of submissions and comments.
[0]https://www.reddit.com/r/dataisbeautiful/comments/8aek7d/red...