Venture investor Marc Andreessen of Andreessen Horowitz doesn’t have many media investments, apart from small stakes in sites like Pando Daily, Talking Points Memo and RapGenius — but that hasn’t stopped him from holding forth on Twitter about his views on the industry, a process that includes an often passionate back-and-forth with critics of his views. In the latest instalment of this manifesto, Andreessen looked at what he believes is holding the existing media industry back.