Twitter says it has overhauled its user display to make the messaging service "more visual", as it ramps up competition against photo-sharing services like Instagram.
"So many of the great moments you share on Twitter are made even better with photos or with videos from Vine," Twitter's Michael Sippey said in a blog post.
"These rich tweets can bring your followers closer to what's happening and make them feel like they are right there with you."
Sippey said that starting on Tuesday, "timelines on Twitter will be more visual and more engaging: previews of Twitter photos and videos from Vine will be front and centre in tweets."
Some Twitter users noticed the change, which makes pictures, graphics and videos more prominent.
The company said it was incorporating the changes in Twitter on the internet and its Android and iPhone apps.
The shift comes as Twitter is preparing its stock market debut, possibly as early as next week.
While Twitter has amassed more than 200 million users and a strong core of celebrities, journalists and political leaders, some critics say the service lacks the visual appeal of photo-centric services like Pinterest or Instagram, which was acquired by Facebook last year.
Twitter is seeking to raise some $US1.6 billion ($A1.68 billion) in its IPO, valuing the company in the range of $US9.3 billion and $US11.1 billion.
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