The Facebook we had back then was completely different than what it is today. 100% of the content on the page was contents directly created or shared by one of your friend. No suggested posts, no ads, no news, no "influencers", no politicians, no algorithm, no tracking, etc. Being invite-only at first also means everyone you see on the site are friends or friends of friends, no parents, no teachers, no cops, no media organizations, no companies, etc.

You would login and see what your friends were up to, in chronological order.