Facebook released an update for their mobile app today that makes it a lot easier to get to and use group messaging. According to the update, it now takes fewer taps to start a group message. And, once you've got a group conversation going, it's easier to name the conversation and get to it later.
To start a group conversation, open your Facebook app and tap the chat icon in the upper right corner, or simply swipe to the left to reveal your chat favorites. Tap the New Message button and begin adding people to the conversation.
As soon as you start the conversation, a field field will appear above the conversation that you can use to name it. In the upper right, tapping the (i) icon will take you to the Group Info area where you can change the name, add more people, adjust notifications or even leave the conversation.