Abstract: A system and a method for facilitating joint orders (“co-orders”) from one or more associated customers and non-customers to one or more vendors via computer networks. The system includes one or more customer subsystems, one or more vendor subsystems, at least one coordination subsystem, zero or more social network subsystems, connected to computer networks. One user fixes one or more parameters of a co-order, sends zero or more invitations to other users to join in forming the co-order, which they can accept. Information about the co-order is synchronized between participating user devices. Once users have agreed on particulars of the co-order, it is placed with one or more vendors. Users may be customers and non-customers thus allowing participation of experts, friends, etc.