Facebook messenger has many merits and its very easy to use and save time. I have installed it in my mobile.its very useful. I can save more time while checking the messages as in Facebook messenger the message notification pops up when internet is turned on.if you are addicted of facebook or chatting things, this is perfect software. now they upgrade too many facilities like face time, /audio/video calls, Emoji and many more, generally what people are doing they install app for private chatting.Facebook messenger is very fast we can chat here easyly facebook messenger is very user friend and we can see who is active. facebook messenger is only for messenging and Group chats.we can get it free of charge its is the best