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That wasn't their reasoning at all, they allowed a subset of accounts to have 280 characters for several weeks. During that time they did quantitive analysis that showed only 5% of tweets sent by those accounts went over 140 characters and 1% went over 190 characters. That's why they think most people won't use 280 characters. However increasing the number of characters allowed alleviates a problem where 9% of all tweets in English ran up against the 140 character limit.

Noted. But did they did choose a random subset of users? Seemed more like “influencers” and “twitterati”
 
The character count got removed and has been replaced with a circle, when you’re running out of characters then it shows the number of characters left.

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