I am very irritated with the facebook messenger. When I install it in my handset. My handset alwasy hanged while using it. There is 1 gb ram and 16 gb internal.When I used facebook I am not able to messege any one then I have yo install it. Facebook forcefull compel thier user to install facebook messenger. Where thier user wanted it or not.Inspite of facebook or facebook messenger u can use facebook lite it is very usefull app. Here is boht app facebook or its messenger. I personaly suggest u to use facebook lite.