Messenger app is fast way for messaging with your Facebook account. It is only messenger, without chat, new feed... In every moment you have access to your inbox with new messages. Reply on received messages, and in every moment send new message.
Some functions are limited in Lite version.
https://market.android.com/details?id=messengerlite.boro
Some functions are limited in Lite version.
https://market.android.com/details?id=messengerlite.boro