I probably learned more useful things from working as a lowly assistant for an expert witness in US v AT&T, than from my formal education. So I was all agog when the next big anti-trust case came up, US v Microsoft. But that was also when I began to realize the need rethink of the core concepts. This article in Medium (I hope it will not be paywalled) makes an insightful comparison between the tying arguments that were central the Microsoft case and the loose claims of monopoly being bandied about in relation to Facebook now. While some of the questions and concerns echoed those the senators had two decades ago, Microsoft and Facebook’s situation could not be more different.