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Re: Facebook CAPTCHA verification, when is account verification required (for social media accessibility study)

for

From: Keith (mteye)
Date: Apr 28, 2011 8:54AM

It probably is by a DNS lookup of the IP that is accessing the site. It
makes sense, as most people don't travel widely. Even in accessing the
facebook page by cell phone, most people are within a small area. When the
account is accessed from a signifacant distance, it could be construed that
a malicious attacker is hijacking the account. The verfication process is
definitely a pain, but there is an audio verification as well as the graphic
one. Inconvenient as it may be, my personal take is that it's all in trying
to protect valid users, and guard privacy.

from
Keith H.

-----Original Message-----
From: Birkir R. Gunnarsson
Sent: Wednesday, April 27, 2011 11:15 PM
To: WebAIM Discussion List
Subject: [WebAIM] Facebook CAPTCHA verification, when is account
verification required (for social media accessibility study)

Hi everyone and sorry if this seems very off topic.

I am participating in a study of m.facebook.com and other Facebook
accessibility alternatives for visually impaired users.
We have been wondering when Facebook requires users to verify their
accounts using CAPTCHA and what rules apply.
Of course they do when they create their account in, but, in my own
experience, Faceook also requires account verification whenever a user
changes locations significantly (I have experienced this when
traveling from NC to California and of course when travelling within
Europe).
I do not know precisely how they do this, some type of DNS look up, or
what criteria they use, but if someone has actually worked with this
and can point me to a page with rules on when users will be required
to verify their account (by using CAPTCHA) it would be a very useful
information tidbit for the paper.
Thanks everyone.
-Birkir