Besides,weconsiderthatamessagechannelisformedwhen multiple users are following the same user in the considered system. Further, there may exist multiple channels in the proposed system. By multi-channel, whether a node carries the replica of a message is determined not only by its contact history, but also its interest. Meanwhile, in a specific channel, there are possibly multiple users with the Internet connectivity, working as the intermediate sources for those only with the encounter-based connectivity, so there are multiple sources in each channel. By multi-source, the replicas of a message mightimmediately existafter themessage iscreated andenters the considered system. The multi-source feature improves the chance of delivery, which is important to overcome the difficulty of delivery in ICMN. The features mentioned actually havealargeimpactontheresultantperformanceofthesystem. We take them considered and therefore understand the system performance more accurately and more comprehensively.