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I was running a search on the best method to use the author tag in meta descriptions today, when I noticed an unexpected recommendation at the bottom of page 1.
Google was promoting a page because someone I follow on Twitter had recommended it. I'm not connected (circled?) to Hannah on Google+, so evidently, google has had a look at our respective Twitter accounts that we will both have associated with our Google+ accounts, then it's done the math itself and decided to show me sites that she has shared in my search results.

It's a logical extension of google search plus your world I suppose, and I'm happy to see Hannah's recommendations, but I can imagine this turning search results into a complete mess for anyone who's used the "follow everyone" strategy in order to try and build up their twitter numbers. I've always advised new Twitter users to keep it as relevant as possible, and it looks like this addition to SERPs reinforces that strategy.
Anyway - recreate this effect at home by linking your twitter account to your google+ and then following Hannah here: https://twitter.com/#!/hanskapade (worthwhile anyway as she tweets useful and interesting SEO stuff!) and then recreating this search!
Good luck!