NEW YORK - Snap Inc is considering changes to its Snapchat app, known for disappearing photos and videos, that could make users' public posts longer lasting or even permanent, people familiar with the matter said.

The company is also weighing an option to reveal the identities of Snapchat users who make public posts, a person familiar with Snap's plans said.

Together the changes would mark a big step in Snap's effort to lure and keep users by making content shared publicly via the "Our Story" section, more available outside Snapchat. They could also create a new revenue source for money-losing Snap, which has seen its user base shrink and executives flee the company.

But such changes to Snapchat, which launched in 2011 and became an instant hit among teenagers and millennials, could trigger backlash from users who cherish their privacy, especially as rival Facebook Inc has been plagued by scandals over how it handles user data.

Snap is carefully weighing the privacy, technical and legal considerations of revealing user identities on public posts, said the person familiar with Snap's plans.

Only Snapchat photo and video content shared to "Our Story", which shares the snaps publicly to a wider audience and not just a user's friends, would be affected and users would still have the option of deleting those stories, said the person.

Snap has already extended the shelf life of public stories, but making them last even longer or revealing more about the users who create them would be a further departure from Snapchat's hallmark features.

Snap declined to comment.

The changes would come in response to feedback from Snap's four partnerships with news discovery platforms that help media companies spot, analyse and republish public breaking news content on Snapchat, sources said. Reuters is a customer of SAM Desk and NewsWhip, two of the news discovery platforms.

The news partnerships are part of Snap's "Stories Everywhere" initiative, launched last year to push content to more places outside Snapchat.

Snap announced the partnerships last year and will sign four more deals in the near future, said the person familiar with Snap's plans.

Initially, public stories would disappear after 30 days but now remain viewable for 90 days, according to Snap's support website.

Some partners have said that the disappearing and anonymous nature of public stories makes them difficult to work with, the sources said.

Some news organisations will not embed Snapchat stories into articles because the content eventually disappears, while others will not use them because they are unable to verify anonymous users' Snapchat videos.

One source familiar with the news partnership said Snap is already talking with one partner about making public posts last even longer and to make some content from celebrities permanent.

LUCRATIVE BUSINESS

Snap's stock has been under pressure as investors question the company's plan to reach profitability. Snap shares on Friday closed some 60 per cent below their March 2017 initial public offering price.

Making user content more valuable for partners has helped boost revenue at Snap's rivals.

Twitter Inc was one of the first social media platforms to sell access to public posts or tweets and reported $108 million in third-quarter revenue from non-advertising businesses like data licensing, its fastest-growing division.

Twitter sells access to more than 500 million daily tweets to customers including analytics firms, news organisations and financial institutions that use trending tickers and stories to place trades.

Snap does not currently charge for access to public data, but could earn more advertising revenue if snaps embedded outside of Snapchat last longer, said Debra Aho Williamson, a social media marketing analyst with research firm eMarketer.

"The advertising would be visible for longer, and I could see advertisers paying more for it," Williamson said.

Facebook, viewed as a rival to Twitter in the data licensing market, recently implemented strict restrictions that have in turn made Snap's content more valuable, industry sources said.

Snapchat's video-heavy posts also offer elements that Twitter and Facebook's largely text content cannot, especially in breaking news events, one of the sources said.