Abstract: A waste bag dispensing system comprising a base member defining a cavity configured to receive a waste bag roll, a cap configured to removably secure to the base member, a slit opening extending through the base member, a separator, and a securement means to secure the system to an object, such as a leash. The roll may comprise a plurality of waste bags in perforated connection around a hollow spool configured to removably receive a base friction post and a cap friction post, the friction posts applying a lateral pressure on the waste bag roll and a tab may apply pressure on an exterior of the roll. An end of the roll may extend through the slit opening towards the separator which may engage the perforated connection and permit the removal of one waste bag from the roll. The securement means may comprise a lateral and vertical stability means.

Abstract: A server receives a request for a service from a first user that defines a location for the service and a category of the service. A first stage of matching is performed that includes determining second users that match the location and category. A second stage of matching is performed that includes performing for each second user: computing a first value that quantifies an attractiveness of the request to that second user, computing a second value that quantifies a likelihood of the first user selecting that second user to fulfill the request, and computing a third value based at least in part on the computed first and second values. A request for the service is transmitted to at least some of the second users whose computed third value exceeds a first threshold value.