This paper addresses the problem of consensus of multi-agent systems, consisting of a set of identical continuous-or discrete-time systems, connected through a network with fixed topology. The information exchanged over the communication network is the output of each system. First, necessary and sufficient conditions are given for the uniform global exponential stability of the consensus set. Then, the quality-fair delivery of media contents is dealt with as an application of the presented equivalent conditions, which lead to a control design paradigm consisting in a suitable linear static output feedback design problem. This problem is solved proposing an iterative design technique based on Linear Matrix Inequalities (LMIs), and its effectiveness is demonstrated via simulation results, where we compare our results with pre-existing approaches.