Instagram adds group video calls, a new Explore section, and more camera effects

Instagram recently hit 1 billion monthly active users, and the Facebook-owned service isn't showing any signs of slowing down the relentless pace at which it keeps adding new features. This strategy is probably behind the fact that the average US user went from spending 29 minutes per day on Instagram in September of last year to 55 minutes today, according to a SimilarWeb report for TechCrunch. Today, group video calling has started rolling out in the Instagram mobile apps. You can chat with up to four friends at a time, straight from Direct, by tapping the new camera icon in the right...