I tried Bing and Yandex to find the email bodies. They didn't return many results (but they do return results).

http://www.bing.com/search?q=%22wants+to+be+friends+on+Faceb...

When I try on Google to find the email bodies, I get 250k results, of which the large majority are on blogspot.com sites.

While mail bodies can be found on a few other sites, like the asdasd.ru example, and other search engines have found these links too, the main issue still seems to be with blogspot.com -- These aren't throwaway accounts with public inboxes, but likely some virus that is intercepting certain mails (Facebook, Twitter, Youtube, Twoo) and reposting them as a blogpost for everyone to see.

As Blogspot is Google-owned, this does seem to me a predominantly Google-specific issue.