We all know that visual CAPTCHAs (those squiggly letters) are barriers to participation for people who can't see at all or can't see very well. Many of us also know that adding an audio CAPTCHA option, while better than nothing, leaves a lot to be desired for accessibility.
But did you know there are companies that pay people to break CAPTCHAs?
The blogging companies who rely on CAPTCHAs to protect their users from comment spam need to find some new tools.
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