fmobi,friendchat,im,ebuddy,nimbuzz... And many other apps are known for all around the world but they aren't the same as fb messenger,they aren't provided with stickers,widget feature,voice msgs as in android...
A devise like c7 and n8 must have an officiall fb messenger in store.
I'm wondering why c3 has fb messenger while n8 doesn't have one ??!
This is weird somewhat :/