Together with mobile software maker Snaptu, Facebook on Thursday launched its branded mobile app for feature phones. The app’s immediately available in 14 countries worldwide. It runs on more than 2,500 devices from manufactureres like Nokia, Sony Ericsson, LG and others, Facebook Program Manager Mark Heynen wrote in a company blog post. Snaptu also offers apps from other companies that can run on a wide variety of feature phones. The app was co-developed by Snaptu and Facebook on the Snaptu platform.