"Based on current smartphone technology, social networks can and should leverage location, time, frequency of interaction, and behavioral similarities."
And this sort of approach encourages a power-law distribution in who ends up in my feed and that's misguided.
The thing is, actually, I want to see the important updates from all of my friends on FB and the fluffy stuff from only my closest friends and family.
It's not just who, but what -- and yes, that's harder to algorithmically assess, for now, but that doesn't change that anything short of it isn't the big-win solution as the author proposes, IMHO.