[fakeanon]

I saw a post about textfile stenography, maybe linked from here or reddit. It used a source text (the example might've been from textfiles.org or a site like that) to hide messages, which looked like the text with glitches or typos or something. I don't not where it is. Here is something that encodes messages so that they look like spam: http://www.spammimic.com/

Y'know how people control botnets with irc or webposts? Maybe it is something like that, as other have speculated. But them why would they be posting messages lots of times? That's a problem in my ideary.

[paulgb]

Kind of like a modern version of a numbers station[1]. I love to think that this is the explanation, but it's probably more mundane.

[1] http://en.wikipedia.org/wiki/Numbers_station

[nisa]

the FSB got caught using YouTube comments.. I'ts only a german source (but a legit newspaper, afaik): http://www.op-marburg.de/Lokales/Marburg/Youtube-Kommentare-...

FTA (Google Translate, slighty modified): However, there were still "other channels" as Attorney Siegmund said: In the "Line D1" the spies took simply Youtube-videos on the Internet. Under harmless videos they put under collusive usernames hidden messages. And then there was, according to the investigators nor the agent Vintage bounce points, mainly in North Rhine-Westphalia. There, hidden mechanical engineer Andreas stop documents that were picked up by members of the Russian headquarters.

They were even links to accounts.. can't find a better source at the moment.