My first question was what does Plato have to do with theories that are applied to digital technology? It seemed odd because Plato couldn't have even conceived the idea of computers. The reason his philosophies apply is that Critical Theory as it applies to digital media is not a body of work that stands alone. Rather, it evolved out the theory for print media which evolved out of theory applied to oral communication which is what concern Plato. Plato discussed ideas of communicating, so his writings are still relevant as long as we are still communicating.
In exploring this site, you'll find that Plato is mentioned often. Here are some links discuss his ideas: