in reply to Captcha Signups?
I have 14 PCs at home. I can create as many logins as I want (almost) on every PC. That creates a high number of cookie sets. Furthermore, I can have as many (almost) e-mail accounts as I want.
"What prevents users from signing up multiple times...
Nothing as long as the user is ready to do it manually. And some users may be so committed.
Everything went worng, just as foreseen.
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Seekers of Perl Wisdom