Facebook’s Instagram Blocks Twitter Photo Service Feature

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Facebook Inc. photo-sharing service Instagram is making it harder for users to display pictures on microblogging site Twitter Inc. amid increased rivalry between the social-networking websites.

Twitter users are experiencing “issues with viewing Instagram photos,” the San Francisco-based company said in a blog post. Instagram, a mobile-photo sharing service that Facebook bought in August for $715 million in cash and stock, has disabled a feature called Twitter cards for showcasing photos and other media. Photos from Instagram now appear cropped, Twitter said.