This is only on pages with a Google +1 box on my website: It seems to be firing off an event on every mouse move. Anyone know what it is doing? I searched on Google (perhaps I should try Bing for once on this one!) but no one seems to have written about it. Is it recording information about my visitors browsing habits? Is it some sort of CAPTCHA to detect human like behviour? Example URL, press F1
![Why does Google +1 record my mouse movements?](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)