Pulse news reader app takes on Flipboard with social feeds from Facebook, Instagram, Tumblr, and YouTube

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 ...