In a way after Snowden revelations we all now need to learn Aesop language (slang is actually almost in-penetratable to computer analysis, unless they are specifically programmed for the particular one) and be more careful.Many people understand why "Fecebook" users should be .
The same is true about your usage of internet, but here situation is a little bit more complex because there is no guarantee that after Snowden revelation people do not try to distort their browsing provide, It is pretty easy to do using any programmable keyboard, or scripting language and Expect-like module.
I can see why Brazil and Germany are now concerned about NSA activities.
The problem is that if your emails are being stored "in the cloud" each single email is exposed as if it permanently "in transit".
Moreover the collection of email in your Inbox is a more valuable set of information than any single email and tells much more about you that any intercepted email can.
.onion is a pseudo-top-level domain host suffix (similar in concept to such endings as .bitnet and used in earlier times) designating an anonymous hidden service reachable via the TOR network.