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Comment by Aldipower | Hacker News Reader

Posting this link on Facebook forces me to answer a captcha, what I have never seen before at this point. Then trying to follow the link, the FB-redirect produces an Internal Server Error, so the link to the Tumblr page isn't working. Haha, 500 Code on an simple link, while other links are working.

There must be the NSA behind it! :-D

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Funny you say that, the same thing happened to me. Where are you located? I'm in Australia. Never ever received a Facebook captcha before when posting a link and to make it more interesting, I was posting the link in a secret group on Facebook which only the invited members would see anyway.

Facebook have long used captcha barriers on suspicious links. The nastier of them won't even be able to be posted at all, a blacklist which included the Pirate Bay for a short period.

Stackexchange is using the same approach to get rid of trolls.

Probably a large volume of the link being shared, triggering the anti-spam filters at Facebook or something...

Same here in germany. I've never seen a captcha on Facebook before.

I see them when I access from some other country and an internet cafe.

It also asks me to identify 5 friends by their pictures, which is a great guessing game because some of them have tagged plants, food or whatever as themselves, and I am bad at recognizing aquaintances I've met in some place and added on facebook and yet never talked to again.

Yup. Same thing happened to me! Got the captcha but it posted fine.

I'm in the US, and had the same exact problem.

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