Why would Secret have liability in such a suit? If someone starts a blogger account and uses it to accuses someone of being a (for example) a neo-Nazi, then would the accused sue Google for libel?
It's tricky, but it would probably come down to a determination of whether Secret is a "publisher" or a "distributor" of its content. Case law is generally on Secret's side, in as much as online message boards and hosts are not considered responsible for the statements their users make. But I can see a scenario in which determining what, exactly, Secret is introduces complications to the "message board" category.
In your Google example, Google is in no way responsible for the content of someone's blog post. Google is not the publisher of that content, and is debatably not even the distributor.
