Facebook + Google definitely do this, it's part of detecting user authenticity and sentiment. I'm pretty sure they even keep track of if you copy paste text in or not.
https://www.dailymail.co.uk/sciencetech/article-2525227/Facebook-tracks-type-DONT-post-update-comment.html
They also probably measure mouse movements, duration content is on screen, what links you hover on but don't click, etc.
I wonder if Twitter does too.
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