Wall to Wall Messageboard Addon (1.0)

http://community.elgg.org/pg/plugins/costelloc/read/15366/wall-to-wall-messageboard-addon

This plugin adds a Facebook-like wall to wall capability to the current Elgg messageboard. It replaces the history link on the messageboard. The two primary benefits are being able to view a conversation that you were not a part of and being able to leave a new message on a conversation that you were a part of.