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I have a rough design for this system, but I have yet to implement it. My idea is to allow friends to give each other gifts, powerups, etc once per day. Nothing significant, but in a competitive game, every HP and GP counts.I really hadn't considered any limitations on what they could not do.
Its a sort of dungeon crawler like LORDS. The idea is that you lose HP through playing, and healing cost you either lots of money or lots of turns. Once per day, for up to 20 friends, I plan to allow your friends to gift you in the form of healing (gain 1 HP), give you gold (1 GP) or if you're dead, they can cast a prayer and reduce resurrection wait time by a turn. If a player has 2000 HP, or your daily gold income is 2000 GP, this equates to a 1% advantage in-game. I think this is just enough to provide a social side of gaming, will help attract players, and yet still remains semi-balanced. I have also considered giving players who do not have friends the option to vote on one of the many bestbbg game sites which will prevent incoming gifts, but provides a kickback near equal to what having friends would give.