Disclosed is a square cigar tube, comprising a first square tube part and a second square tube part. A play sequence policy is selected for the identified channel based on the determined genre. The INE originates a call to the party to whom the subscriber desires to reply. Each of the interconnect boards includes interconnect chips that are reconfigurable to selectively interconnect the logic chips of different ones of the logic boards. Thus, when the frame is joined with the case, firstly, each hook catches the case, and then, the elastic buckle piece is embedded into the case, thereby mounting the fixing device with the fan on the case. The present disclosure also includes a method for retrieving social videos.