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Hey all,

My site allows advertising from other sites under a guest account. However, I'm getting lots of spam, even though there's a captcha on the site. Is there another captcha or a secret answer I can use to cut down on this?

you can try using Are You A Human Captcha or NoCaptcha ReCaptcha

admin panel >> configuration (settings) >> General Configuration >> CAPTCHA Images for Registration & Posting

I'll give it a try, thanks!