Gotten this question a few times today...so gonna answer it for everyone all at once.

Question: Why does sometimes doc add a word or two to his linkedin posts?

Answer: 2 reasons. One, twitter has a character count, linkedin does not. I have experimented and even copy and pasted docs messages from linkedin and they exceed the twitter character count(not the most recent one). Second reason, I think because linkedin is for business professionals and he has more contacts and followers there and its a more professional platform. It reaches a wider audience.