Facebook is the largest social media app in the world so it is essential to get it on our device. It is straightforward to use it on Android, Apple & Windows smartphones, as we can download it from Play Store, App Store & Windows Store, respectively. It is totally different on the smartwatches like new Galaxy Watch Active, older Gear S3 & Gear Sport, because wearables are not made for such apps. The apps like Facebook, Facebook Messenger, Instagram, WhatsApp, Twitter, Viber, etc. uses lots of space & consumes most of the battery & take lots OS memory space on