Though Quora can be useful requiring an account whereas the full text is freely crawled (cloaking) is against Google's guidelines[1] and as mentioned in their h

Though Quora can be useful requiring an account whereas the full text is freely crawled (cloaking) is against Google's guidelines[1] and as mentioned in their help page violating the guidelines is a reason for the site not to be shown. Based on that, what should definitely be banned is Pinterest which goes against half the guidelines. [1]: https://support.google.com/webmasters/answer/35769?hl=en https://support.google.com/webmasters/answer/35769?hl=en