Twitter planned to leave the old limit in place for tweets in languages such as Japanese, Chinese, and Korean.
What do you think of the new 280-character limit?
"When people don't have to cram their thoughts into 140 characters and actually have some to spare, we see more people tweeting", Twitter added in a blog post announcing the move.
Twitter plans to collect data on the test and evaluate it before offering longer tweets to all users.
Even nearly daily usage by US President Donald Trump, who Tweets his thoughts in the early hours most days, has failed to encourage a larger take-up of the service. More pressing than expanding the character count, they say, is curtailing trolls, hate speech and the potential for Trump to unwittingly start a war through the platform.
"We understand since many of you have been Tweeting for years, there may be an emotional attachment to 140 characters-we felt it, too".
The 280-character limit will make it easier for users who tend to favor multiple-entry tweet storms, he told TechNewsWorld, but that could negate part of the appeal of Twitter, which is the compressed nature of the posts. The founders, including the CEO Jack Dorsey, wanted smaller text boxes that could accommodate texts just below the SMS limit of 160 characters.
Just this week, Twitter had to deal with questions about why it kept a tweet up in which the President threatened North Korea. In a blog post explaining the change, Twitter didn't say when the new feature would carry over to everyone.
Twitter's biggest challenge is growing its user base among real people - and not the bots and anonymous trolls that clutter it with objectionable material.
Twitter responded with a pledge to review its policy while noting that "newsworthiness" and public interest must be considered in deciding whether to take down a tweet. Knowing this fact, a lot of hassle has been created among the users who are also willing to try out the new 280 characters feature.