Basically, the timeline was just another word used for the feed.
He didn't want to see the feed that everyone was posting because he knows it just saps your attention / can be toxic, but he wanted the ability to post on other people's feeds so they would see the content he wanted to promote.
I don't use socials, so I need some help understanding this sentence, please.
What does it mean to "[not] see the timeline" and why is it important?