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http://www.socialtimes.com
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http://www.socialtimes.com/2008/08/is-iphone-captcha-necessary/
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Social Times: Is iPhone Captcha Necessary?

Charlie · 1 year ago

I'm actually surprised to see you ask why it's necessary. Of COURSE it's necessary. We live in a world of bots and automated registration that only leads to spam, spam, and more spam. If they didn't require captcha for all user-agents, then someone could just spoof the user-agent header to pretend like they were an iPhone and make 10,000 accounts.