The summary discusses Virginia Heffernan's essay "The Attention Span Myth", which argues against the idea of a fixed attention span. While initially outlining both sides of the debate around technology's impact on attention, Heffernan ultimately questions the definition and existence of the attention span itself. The summary states that Heffernan fails to provide strong evidence to support her claim that the attention span is an inaccurate measurement tool, and gets distracted discussing ideas without fully backing up her conclusion that attention spans are a "phantom" concept.