World of Warcraft's Recruit a Friend program is rewarding for both the gamer and the person he invited. Not only will the one who got invited will get a free trial period, but the gamer will also get his own free period of game time.

Now it seems that Blizzard may soon add a bit more dimension to the program to make the gaming experience more fun for everyone. Take a look at these files listing error messages found within the game recently:

• ERR_REFER_A_FRIEND_DIFFERENT_FACTION = "You cannot grant levels to a character of the opposite faction.";
• ERR_REFER_A_FRIEND_GRANT_LEVEL_MAX_I = "You cannot grant levels to players level %d or higher.";
• ERR_REFER_A_FRIEND_INSUFFICIENT_GRANTABLE_LEVELS = "You have not earned enough levels to grant any more levels.";
• ERR_REFER_A_FRIEND_NOT_NOW = "You cannot grant that player a level right now.";
• ERR_REFER_A_FRIEND_NOT_REFERRED_BY = "You were not referred by that player.";
• ERR_REFER_A_FRIEND_SUMMON_COOLDOWN = "You can only summon your friend once per hour.";
• ERR_REFER_A_FRIEND_SUMMON_LEVEL_MAX_I = "You cannot summon players above level %d.";
• ERR_REFER_A_FRIEND_TARGET_TOO_HIGH = "That player's level is too high.";
• ERR_REFER_A_FRIEND_TOO_FAR = "That player is too far away.";
• FACTION_STANDING_INCREASED_BONUS = "Reputation with %s increased by %d. (+%.1f Refer-A-Friend bonus)";

The code suggests that those who recruit a friend to the game may soon be able to grant a level to the one they invited, as well as summoning him. Nothing's been announced yet so we might not see this come to effect, but it's still an interesting concept, eh?