Todd, so far, I am asking the question, not yet necessarily volunteering to provide a brute force solution! Obviously, thought, I'd be open to collaborating if there was a consensus.
I agree there's a lot of stuff that has no shelf-life, but there's also a lot of info in here that ought to be made more accessible, and perhaps worth an effort.
If this requires a team of screeners to read messages and assign predetermined tags, which could then be used to build a user-friendly, browsable database, that might well be worth organizing.
Am wondering who has already solved this problem, and how much can be automated, rather than relying 100% on human intervention . . .