SAN FRANCISCO (AP) — Twitter has unveiled a new look, and much like some previous changes the company has made to its short-messaging service, it's not going over so well with the Twitterati.

The San Francisco company says the new design emphasizes simplicity, making it faster and easier to use, with bolder headlines and more intuitive icons. It also changed users' profile images from square-shaped to round.

The company said the new user interface will roll out on twitter.com, Twitter for iOS, Twitter for Android, TweetDeck, and Twitter Lite in the coming days and weeks.

Twitter users immediat...