3 ms·http://xkcd.com/810/ http://xkcd.com/810/by nodata 16y agohttp://xkcd.com/810/ http://xkcd.com/810/eru 16y agohttp://xkcdexplained.com/post/1395792545/constructive http://xkcdexplained.com/post/1395792545/constructivearchgoon 16y agoCaptchas are not restricted to reddit and social news site, despite what your link claims.eru 16y agoOh, that was just to make fun of xkcd. I don't think xkcd links are really that good an addition to a discussion here.