This is the amazing app which was released by facebook
over a 3million people had installed this app the best thing about this is it works even on 2g net it does not need any messenger app to chat with friends
it does not create any cache it do not hangs our mobile it works even on low ram mobiles
you can control the adds you can stop notifications
you can download it faster it uses less space but some times it shows the un necessory content which makes it some annoying