[adventured]

Quora also disallows the ia_archiver agent.

http://www.quora.com/robots.txt

Here is their explanation (in the robots.txt file)

"We opt out of the wayback machine because inclusion would allow people to discover the identity of authors who had written sensitive answers publicly and later had made them anonymous, and because it would prevent authors from being able to remove their content from the internet if they change their mind about publishing it. As far as we can tell, there is no way for sites to selectively programmatically remove content from the archive and so this is the only way for us to protect writers. If they open up an API where we can remove content from the archive when authors remove it from Quora, but leave the rest of the content archived, we would be happy to opt back in. See the page here: https://archive.org/about/exclude.php"

"Meanwhile, if you are looking for an older version of any content on Quora, we have full edit history tracked and accessible in product (with the exception of content that has been removed by the author). You can generally access this by clicking on timestamps, or by appending "/log" to the URL of any content page."