A social networking system presents content items to users, who then provide feedback regarding pairs of content items. The inner conductor is formed of a conductive material, and has a small-diameter portion, a large-diameter portion, and a resilient portion axially disposed so as to be integrally and continuously formed with each other. The CPU then directly branches off to a position containing an interrupt service routine addressed by the inputted branch instruction instead of a general CPU instruction, similar to interrupt handling in CISCs with vectored interrupts. The block-data operation facility is embedded in the iVLIW ManArray architecture allowing its generalized use across the instruction set architecture without specialized vector instructions or being limited in use only with repeat or loop instructions. Each projection and the pair of arms of an adjacent contact together define a receiving space and located at three sides of the receiving space, respectively.