Although Instagram photos can still be shared on Twitter, they no longer display correctly because the company has disabled its integration with Twitter cards, the feature that ensures media content is displayed directly in the Twitter timeline.
Instagram photos now appear too large for the space provided on Twitter and are cropped as a result.
In a status update on its website, Twitter said: “Users are experiencing issues with viewing Instagram photos on Twitter. This is due to Instagram disabling its Twitter cards integration, and as a result, photos are being displayed using a pre-cards experience.”
The move shows the growing rivalry between Twitter and Instagram, which was bought by Facebook earlier this year. By disabling Twitter cards, Instagram will force Twitter users to click through to its site to see the entire image.
Social networks are growing increasingly protective of their platforms as competition rises for users and for advertising revenue. Twitter has, in recent months, tightened its rules on what third-party applications are able to do, in a move that his been interpreted by some observers as an attempt to keep users on its platform.
Instagram used to work closely with Twitter but the relationship has suffered since Facebook bought the app. Instagram has since offered tighter integration with Facebook and has launched its own web pages for the first time so that users can see their photographs online.
Last month, Facebook proposed changes to its data-sharing rules that would allow the social network to use data collected by Instagram to "tell us information about you" and "improve the quality of ads."
The change will allow Facebook, which has more than a billion registered users, to build more complete profiles of its users - and target advertisements - using people's personal data from its social network and from Instagram.
According to the New York Times, Twitter is working on Instagram-style photo filters for its own app.
Shane Richmond, Telegraph.co.uk