Ask and ye shall receive (probably)
http://www.spigotmc.org/threads/cross-server-friends-for-bungeecord.14944/#post-708192
Profiles is a BungeeCord plugin with MySQL support that provides a friends system and social network for your Minecraft server.
Commands - Description [Permission]
/friend list - Shows all your friends [profiles.friend]
/friend requests - Shows pending friend requests [profiles.friend]
/friend add (name) - Add a player or send them a friend request [profiles.friend]
/friend remove (name) - Remove a player from your friends list [profiles.friend]
/profile (name) - View a player's profile [profiles.profile]
/status (status message) - Set your status on your profile [profiles.status]
/fm (friendname) (message) - Send a message to your friend [profiles.message]
/ip (name) - Shows all known IP addresses of a player [profiles.ip]
/aliases (name) - Shows all known aliases of a player [profiles.alias]
/dump (name) - Show all name and IP data on a player [profiles.dump]
Please report bugs on the subforum and I'll fix them as soon as I can.

Profiles 1.1.4
Friends System and Social Network with player tracking and instant messaging.