Back in September, the company announced that it was testing the controversial 280 character limit to allow users to express more than was previously possible with just 140 characters. The company confirmed the new 280 character limit via a blog post. Users also felt that upping the limit to 280 would make Twitter less readable. The new 280 character limit aims to benefit people tweeting in languages that require more space to express their thoughts. You'll know when you have reached the 280 character limit once the circle fills up.
Source: India Today November 08, 2017 06:11 UTC