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It's not uncommon to receive a lot of spam comments on your blog, or to have fake users register on your site. The same applies to guest books, forums, and regular contact forms.
AKISMET and CAPTCHA are two effective tools for fighting spam submissions and fake registrations.
Akismet: Follow this guide to reduce the risk of spam comments on your site.
CAPTCHA: There are many solutions available, but Google offers a popular and well-maintained one. It helps prevent or reduce unwanted comments on your site. Visit reCAPTCHA to get started.