Does Google tell people the signals it uses for websearch? Does Gmail tell people the signals it uses for spam classification? Actually even today, does Googl

Does Google tell people the signals it uses for websearch? Does Gmail tell people the signals it uses for spam classification? Actually even today, does Google tell the signals it uses for its new Recaptcha?: http://googleonlinesecurity.blogspot.com/2014/12/are-you-robot-introducing-no-captcha.html http://googleonlinesecurity.blogspot.com/2014/12/are-you-rob...