Dead startups don't tweet

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Well, this seems like a good way to track the death of startups — (here's the US list), presuming a startup's use of Twitter is a good indication of life/health!
This is a really interesting concept. I am following all markets. Would love to know how you monitor.
@ericataylorpr What exactly would you like to know?
TIL Berkshire Hathaway was dead because they stopped tweeting
Now itself is dead
May be an interesting idea but its current implementation isn't working - the few accounts I checked have tweeted multiple times in the past few days