Those models don't work for distant friends. I should call my mom more often. However nobody would call someone they were distant friends with 20 years ago to talk about their kids sports game - but 10 seconds to see those pictures on Facebook is still appreciated. When that is what Facebook does it is valuable.
what's the point in seeing photos of a kids sports game if you are so uninterested in maintaining a relationship that you'd never consider chatting with the person? at that point, it may as well be a parasocial relationship with a celebrity where you look at photos of their life and say "wow, i'm so glad i've connected with them".
there's a difference between being informed about the goings-on in somebody's life (which social media browsing/posting can help with) and actually having relationships with people.
The point is to have something to talk about at the next reunion. It won't be for several more years, but I do plan on connecting again. Remember these pictures take only seconds to view, but they ensure when I next meet that person we have some place to start from when talking.
