Instagram has announced an enormous update which could turn it into a Facebook-style popularity contest. The app has vowed to show users "the moments we believe you care about the most", with posts sorted according to the "likelihood you’ll be interested in the content, your relationship with the person posting and the timeliness of the post". Fans are worried this could mean that the most "liked" images are given priority, which could turn photo feeds into a non-stop carousel of Kardashian pics and celebs on holiday.