My "bar" for how Google does here is how it treats recipe pages. I absolutely loath what SEO has done for recipe pages, because now essentially every recipe page looks exactly the same: 1. Tons and tons of content about the history of the recipe, how humans first domesticated wheat, when the ancient Egyptians first discovered yeast as a leavening agent, etc. etc. 2. Then, after thousands and thousands of words, there…
Unfortunately for Google, G+ was probably their best chance at something like that. Now they just have stuff like time on page to try and figure that out.