Almost every time I've discussed Twitter w academics who don't tweet they say "it's a waste of time — no signal" even though I've never argued w them 1 way or the other. I mean OK they aren't 100% wrong since anything can be framed as a waste of time, esp w these types of ppl. 
Just to clarify, the people I have in mind in the OP have accounts. 
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They just refuse to tweet. Because — you guessed it — it's not shown to be anything but a waste of time.
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