Pulse is one of the better-known RSS readers out there, with apps for iOS, Android, and Kindle Fire as well as browser integration. Now, a new update to Pulse (for iOS and Android) lets users add social profiles from sites like YouTube, Tumblr, Facebook, and Instagram in addition to the standard Google Reader news feeds that Pulse has long supported. This update puts the app squarely in competition with social news aggregator Flipboard, which had a pretty big year as it blew past the 20 million user threshold last summer. To go along with the new social sources, Pulse has also redesigned the app to improve photo- and video-viewing — all the distractions are stripped away so that the image or video can be the focus. The updated Pulse can be downloaded now from the iTunes Store or Google Play.