mass mailouts, but only for admin, with this plugin you can send messages for all site, or only for one group.

http://community.elgg.org/pg/plugins/project/485322/developer/webgalli/mass-mailout-plugin-for-elgg-send-messages-to-all-users

Maybe could found for you,: Westors elgg manager.

http://community.elgg.org/pg/plugins/project/553265/developer/westor/westors-elgg-manager

but im looking for plugin that ordinary user can send to many friends, just like facebook message can send more than one friend at once.