If you look at the bottom of that Blogger post, it says "This message was sent to <a gmail address>." So an email from Facebook got posted as a web page to this blog.
There's no need to suspect some virus that's intercepting emails. Plenty of people have set up their systems such that email messages get turned into web pages.
You are probably right and I apologize for any misinformation. To me it seemed strange that the blogs first started spamming, followed by publishing only certain emails. Wouldn't it make more sense if all emails were published, not only from certain webservices? Why would a user want to publish their private Facebook emails in the first place? None of these accounts posts normal updates, they act compromised.
If you look at the bottom of that Blogger post, it says "This message was sent to <a gmail address>." So an email from Facebook got posted as a web page to this blog.
There's no need to suspect some virus that's intercepting emails. Plenty of people have set up their systems such that email messages get turned into web pages.