1. A computer-implemented method, comprising: at a server system having one or more processors and memory storing programs executed by the one or more processors to perform the method: registering a partner for a joint advertising program, including: receiving advertising partner information for the partner; registering the partner for the joint advertising program in accordance with the received advertising partner information; and while registering the partner for the joint advertising program: creating a partner web page responsive to receiving the advertising partner information, the partner web page having a format in accordance with the advertising partner information, wherein the creating includes transmitting an authoring web page including an embedded authoring tool to a partner computer using a network, the authoring tool for composing the partner web page at the partner computer; and storing the partner web page on a server, so as to make the partner web page accessible to users other than the partner; and transmitting at least one advertisement for the partner to a plurality of client systems associated with a plurality of distinct users, including a plurality of users other than the partner, wherein the at least one advertisement for the partner includes a link that directs a client browser to the partner web page stored on the server.