Comment spam is really an issue that every webmaster/ blogger should be careful about.As this sort of spam can really affect your site either directly or indirectly.Comment spam annoys typical visitor/reader of your website.
The solution is using CAPTCHA technology.
reCAPTCHA is one such free service offering CAPTCHA to websites.To learn more, visit
http://www.techrena.net/internet/using-recaptcha-comment-spamming/ (Using reCAPTCHA To Prevent Comment Spam In Your Website)
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