The Facebook Messenger app for Android was updated today, bringing feee VoIP calling to users in Canada. This mirrors the way things were done on the iOS app, which saw support for folks in the U.S. about two weeks after it debuted in Canada. While there's no guarantee the Android app will follow the same roll-out schedule, we're going to assume that it will cross the border soon.
In addition to the new VoIP calling, the app allows group conversations to be viewed in the sidebar, and allows them to be searched by name and friends. Hit the Google Play link to update.