SweetCAPTCHA users complain of advertising pop-ups

Website owners are complaining that a free security tool started displaying unwanted advertising pop-ups to their visitors.

The tool is made by SweetCAPTCHA. It requires users to correctly pick out and match images before they’re allowed to do some action on a website. CAPTCHAs are intended to prevent abuse by spammers and automated registrations by web bots.

SweetCAPTCHA was busy Tuesday fielding complaints on Twitter from some who noticed a script that was injecting the pop-up ads. Sucuri, a security company, said the pop-ups promote tech support schemes and bogus dating sites.

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