Abstract: Systems and methods for syndicating advertising content are described. In one embodiment, a method of syndicating relevant user activities includes obtaining a first advertising bid from a first advertising site, obtaining a second advertising bid from a second advertising site, recording user activities with a first participating site, classifying the recorded user activities describing at least one category associated with the recorded user activity, determining an auction strategy based on the first advertising bid, the second advertising bid, the first advertising site, and the second advertising site, where the auction strategy selects at least one winning advertising site, generating an ad unit ad unit including metadata describing the recorded user activity and the at least one winning advertising site, and syndicating the generated ad unit to at least one participating site within an advertisement network.

Abstract: Activity systems and methods for social networks are provided in which user activities are gathered and matched with advertisers and/or publishers and displayed by publishers. Paid links or units can also be attached to these displayed user activities to provide revenue to the user, advertiser and/or publisher. The gathering and matching may be enhanced by a message classifier and an optimizer.