Facebook has increased the set of people able to make use of its live video feature to all iPhone owners in the U.S. Facebook first tested the service with celebrities and public figures before expanding to a small set of iPhone users back in December. Similar to Twitter's Periscope app, live video from Facebook lets people broadcast live video to their friends. Broadcasters see the number of viewers and their names, and a real-time stream of comments. Live broadcasts are automatically saved to users' timelines where they can be kept or deleted. People will be able to see live videos in their News Feed, but may also subscribe to the feeds of their favorite broadcasters. Facebook will send alerts to let people know when broadcasters go live. Facebook said it expects to expand live video to more countries shortly, but hasn't said when Android devices will have access to the feature.