I have been using facebook messenger for a couple of months. The app is a total disappointment. It has much data usage than normal messaging apps like whatsapp.
Coming into the usage, it is not user friendly. There is much hang in moving through messages. There are also games provided in the app but they are very much boring.
The only interesting thing I found is we can react to every single message with emojis. The major defect found in messenger while messaging is that unlike whatsapp we cant reply to a specific message.
Messaging through other browsers is much easy as I suggest