Described herein are a system and method for delivering content to a mobile computing device, where the content is selected for presentation to a member of a social network service based on the current geo-location of the member and one or more associations andor relationships between entities represented in a social graph of the social network service. Ventilation means are provided inside the insert such that an air current may be created and further that the air current may be led past the electrical installation, such that the overall heat accumulation inside the device may be drastically reduced. The engaging holder portion engages with the anti-rotation engaging portion in a circumferential direction when the clamp body is fitted on the clamp mounting portion. One of the sets of knuckles cooperates with a hinged pin to pivot relative to the first link while the second set of knuckles receives a hinge pin to pivot relative to the second element.