Digital Trends – On Tuesday, Facebook launched its second official mobile app, dubbed Facebook Messenger. The free app, which is made for iOS and Android devices, allows users to chat and send messages instantly over Wi-Fi, 3G and 4G connections, or via SMS text message. Less than 24 hours after its release, some already claim that it stands as a major competitor to BlackBerry Messenger, Appleâs soon-to-launch iMessage, and even standard SMS texting services. Here, Iâll take you through a hands-on walkthrough of Facebook Messenger to help us all get a better handle on what Facebook Messenger is â and which services it may or may not smother.