Since its launch in 2006, Twitter has restricted its users to posting 140 character messages but now it looks like that limit could soon be doubled allowing tweet to contain up to 280 characters.
The 140 character limit was chosen at a time when many users updated Twitter via SMS which had a limit of 160 characters.
Twitter have announced in a blog post that they're currently testing the expanded limit in all languages apart from Japanese, Chinese, and Korean. These three languages are more dense so they can already pack in more information per character.
According to the company's data, 9% of all tweets in English hit the 140 character mark, whereas only 0.4% of tweets in Japanese do the same.
Twitter say the reason for the change is because the 140 limit has become "a major cause of frustration for people Tweeting in English". They've already removed media attachments and @reply usernames from the character count.
There's not yet a date on the expected rollout of the new 280 character limit, but the changes are currently being tested by a limited number of users and are expected to be pushed out to all users in the near future.