platforms open innovation strategy network effects two sided networks ecosystem business model apple boston university marshall van alstyne mit information economics decision theory externalities first amendment governance §230 section 230 disinformation misinformation free speech fake news platform design supply chain architecture industrial organization unicorns market capitalizaion course community mobile direct mail interactivity search stamp usps print advertising qr code eday13 emerce facebook sony google amazon microsoft blackberry global brands two-sided market ibm tulane geoffrey parker marco di maggio productivity statistics knowledge management information technology
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