SimilarityRank
Captcha 0.923 96353
captcha 0.881 72786
Akismet 0.775 89123
XSS 0.731 84911
Disqus 0.726 67989
Javascript 0.724 24724
JavaScript 0.724 10887
OpenID 0.714 64432
anti-spam 0.713 60734
URLs 0.708 17764
spam 0.707 7261
whitelist 0.706 86702
javascript 0.699 26375
trackbacks 0.693 99400
workaround 0.691 38017
HTTP 0.689 17252
Gmail 0.687 16215
spammers 0.687 27484
OAuth 0.687 86312
bots 0.685 26025
server-side 0.684 45060
HTML 0.683 6459
GMail 0.682 71260
IE8 0.680 70960
URL's 0.679 79602