How reCaptcha works. 100mil words per day = 2.5mil books per year [video](t.co)1 points·by rapidstuff·15 ปีที่แล้ว·-1 commentst.coHow reCaptcha works. 100mil words per day = 2.5mil books per year [video]http://t.co/yIYJJuqE0 commentsPost comment—