NSA is Collecting Lots of Spam.

wiredog writes: Lots of it. Overwhelming amounts, perhaps. From The Washington Post

when one Iranian e-mail address of interest got taken over by spammers. The Iranian account began sending out bogus messages to its entire address book. ... the spam that wasn't deleted by those recipients kept getting scooped up every time the NSA's gaze passed over them. And as some people had marked the Iranian account as a safe account, additional spam messages continued to stream in, and the NSA likely picked those up, too....Every day from Sept. 11, 2011 to Sept. 24, 2011, the NSA collected somewhere between 2 GB and 117 GB of data concerning this Iranian address.

Spamanography

[barista]

IMHO, spam, as a form of steganography, would be an ideal place to hide a secret message because most people would dismiss it as spam.