FB knows the optimal amount of ads to show a user, and that has to vary between time spent on the site. Someone who just glances at the site could see significantly less ads than someone who a "perma-scroller" for lack of a better term.

I removed the feed completely, but still kept my account so I can still engage with groups, which is the only thing keeping me there. https://addons.mozilla.org/en-US/firefox/addon/news-feed-era...