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. 
I dunno, but these people haven't even really used it so I can't really excuse their BS. 
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Trying to do anything useful on Twitter if you don't have an account can be daunting. But of course if you have no experience using it, how would you know it's a waste of time?
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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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Also depends on when they started. For some reason my carefully curated list of scientists all started tweeting about politics in 2016. ;)
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I don't mind, because I decided to follow humans instead of PR accounts.
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I have been doing politics on social media since 2009. Also I never thought science was apolitical [true for both meanings of the word]. Science, like life, is rife with politics.https://twitter.com/KordingLab/status/934887132711317504 …
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True, but there certainly are days where I prefer the random termite colony picture, or a Cordyceps zombie...
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I've not found twitter to be particularly enjoyable. If you're not part of some close knit group, you're simply ignored. Especially if your profile doesn't match an expected pattern.
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