While Google has officially stated that search results are not case-sensitive, observant SEOs in both the U.S. and the U.K. have recently reported seeing some case-sensitivity variances in the wild. Chris Silver Smith offers screenshots of two instances, one in the travel vertical (for "Chicago Hotels" and "chicago hotels") and the other for a general search ("Fossil watches" vs. "fossil watches")--and while the SERP differences are subtle, they are still noticeable. "If this continues much longer, I think that SEOs will likely start doing all sorts of case-sensitive keyword research and optimization based off of it," Smith says.