You're thinking of something else, Groups didn't exist until 2010 (though I thought it was a bit earlier, like 2008 - I thought they came out about the same time the Network pages went away, while I was still in college): https://www.theguardian.com/technology/2010/oct/07/facebook-...
I do remember Friend Lists were much earlier though.
> You're thinking of something else, Groups didn't exist until 2010
No, I'm not thinking of something else. You are assuming that when I say "groups", I'm thinking of the feature called "Facebook Groups" in your link, which is a stupid thing for you to assume.
I do remember Friend Lists were much earlier though.