The Internet provides almost infinite opportunities for message dead drops, and I too have seen cryptic messages that might well be something clandestine. I'd imagine the NSA routinely sweeps them up from high-volume pipelines like FaceTwitter (and remember how Spicey's posting of random strings on Twitter was caught immediately? It stands out.); but, by implication, a smart spook would look for the odd, low-traffic, corner of the Internet to use as dead drops.

But keeping them sounds like a good idea. I'll make sure they get preserved forward into the next incarnation, where we'll have a way to tag comments as well as posts (because there's no distinction in New Zone), and we can tag these something like "numbers posts". That'd make an interesting canned search, under the thesis that these might be clandestine traffic. Read and speculate irresponsibly!