Methods and systems for group targeting for advertisable calendar entries

A system for encouraging group buying behavior through social interaction among electronic device users, the system comprising:

• one or more server computers coupled to a network;
• and
• one or more databases coupled to the one or more server computers;
• wherein the one or more server computers are for:
• transmitting a first advertisement comprising at least one proposed deal to a user based at least in part on calendar entry information in the user's electronic calendar, and serving the first advertisement to the user via the electronic calendar by displaying the first advertisement within a calendar entry;
• determining if the user has accepted the deal by clicking on a link associated with the first advertisement and the deal in the electronic calendar;
• transmitting a second advertisement to the user based at least in part on the calendar entry information, and serving the second advertisement to the user via the electronic calendar by displaying the second advertisement within a calendar entry;
• providing an interface within the electronic calendar configured to forward the second advertisement;
• displaying the second advertisement including click-through links associated with the user;
• and
• receiving from a user device a negotiated deal based on commitments of the user and at least one other user.