Honestly, even the sushi restaurants example is questionable to me. I think a better algorithm would check to see what/what kind of restaurants I liked in the p

Honestly, even the sushi restaurants example is questionable to me. I think a better algorithm would check to see what/what kind of restaurants I liked in the past, compare that with other people with similar taste, and give me a suggestion. Netflix recommendation for food. It's what I've always wanted from Yelp and Urban Spoon, but never got. It seemed like Google's Hotpot was going there, but that seems to have fizzled. I guess it's not one of the arrows that Larry Page chose. But back to the point, that's not a social algorithm. It's not a page-rank one either, but I'd expect Google to be better at this than FB.