Systems, methods, and apparatus for use with at least one first virtual agent executing on a first device. In some embodiments, the at least one first virtual agent is programmed to: share information with at least one second virtual agent executing on at least one second device different from the first device, wherein the at least one first virtual agent is associated with a first user and the at least one second virtual agent is associate with a second user; and use the information shared between the at least one first virtual agent and the at least one second virtual agent to make a joint recommendation for the first and second users.