An event scheduling request is received, and a disruption factor is associated with each of a plurality of invitees. The stacker has a liftable stacking plate, a handle, a lock claw, and a transmission mechanism. The carrier assembly includes a carrier member having a carrier member body including a planet gear support surface and at least one carrier plate support member that extends substantially perpendicularly from the planet gear support surface. Embodiments of a client interface for use in social networking conference systems are disclosed, and may include threaded chat areas and content sharing areas. The at least one projection substantially underlies at least a portion of the at least one trampoline recess. Preferably, the window is inclined approximately 20 degrees with respect to the preventive member.