Twitter Users Forced To Switch To New Design
All Twitter users will be forced to use the site's new Facebook-style profile designs, which have split opinion on the social networking site.
On May 28, all Twitter users will have been switched to the new view, which features larger profile and header images and the ability to pin a tweet to the top of a page.
New users of Twitter are already being given the new profiles by default, while some existing users have been switched to the design in the past month.
The company made the announcement in a tweet late on Tuesday.
The new design looks more cluttered than the old Twitter set-up, and opinion has been mixed among users.
Meanwhile Twitter shares hit new lows on Tuesday, sinking 17.8% to close at $31.85 (£18.76) - the lowest level since its initial public offering (IPO) in November.
It followed the expiration of the so-called lockup period, which banned sales by company insiders after the IPO.
Twitter's Wall Street debut was impressive, with shares rising from a $26 (£15.31) offering price to more than $70 (£41.23).
But it has been damaged by concerns over its slowing growth and doubts on profitability.
In late April it posts a net loss of $132.4m (£79m).
Twitter co-founders Jack Dorsey and Evan Williams and chief executive Dick Costolo said they have no short-term plan to sell their shares.