Does Google use click-through rate as a ranking signal? If users are clicking and sticking on some results, and bouncing back to the search results on others, that could be a valuable quality signal for them to use in the ranking algorithm.
Some recent tests have shown interesting (and instant) ranking boosts from click activity. Not satisfied with the results of a handful of tests, Darren has set out to test the bejeesus out of: clicks on website links, clicks on Google+ page links, driving directions, and branded search. He’ll describe the tests, the results, and any new insights.