Twitter adds Instagram-style photo features

Twitter has added Instagram-style smartphone photo sharing features after the Facebook-owned service made it impossible for Internet users to integrate its images into tweets. 

Twitter said users can now edit and refine photos. 

Twitter said its partner Aviary is powering filters and other effects for images using Twitter's applications for Apple iPhones or smartphones running on Google-backed Android software. 

A social media feud between Twitter and Instagram escalated over the weekend. 

Previously, Instagram pictures shared in messages tweeted from smartphones can be viewed unaltered at Twitter.