6. The method according to claim 5 , wherein validity of the coupon is subject to a total number of the participants in the social group.
6. The method according to claim 5 , wherein validity of the coupon is subject to a total number of the participants in the social group. 7. The method according to claim 6 , further comprising: providing each participant of the social group with an option to select whether to participate in the receiving at least one first bidding, the receiving at least one second bidding, the choosing and the transmitting.