I run another social news site (realestatevoices.com) and captcha doesn't help. The people inputing these links are 'SEO' firms based out of India. Validating

I run another social news site (realestatevoices.com) and captcha doesn't help. The people inputing these links are 'SEO' firms based out of India. Validating email accounts is worthwhile though. But keep in mind these spammers are actual people not automated in many cases.