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Re:Twitter Considering 10,000-Character Limit for Tweets by chimeracoder on Tuesday January 05, 2016 @12:42PM (#10844653)
> What was its purpose and why is it long past it?

To allow people to use Twitter over SMS. SMS are 160 characters, so a 140 character tweet leaves room for a 20 character header to allow for metadata and actions.

You can still use Twitter this way, which is why (as of relatively recently) you couldn't post a tweet that began with the word "Get", even from the web interface.

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