In a bid to take on Facebook and Snapchat, Twitter has announced to bring Stories-like vertical format, full-screen ads to its Fleets feature for the first time. Fleets are disappearing tweets that sit in a row at the top of users' Twitter handles on smartphones.

"Fleet ads are full-screen billboards for advertisers. Appearing in between Fleets from people, these ads are all about connecting your message with the everyday. Fleet ads are a space for brands to be creative: go behind the scenes, have a creator take over your account, or share a hot take," said Twitter senior product manager Justin Hoang and Austin Evers, global product marketing manager.