>What we need is more effective anti-trust legislation and enforcement, so that a number of platforms can coexist and compete even though there is a strong network effect to having a single platform.

There are a lot of platforms out there today. Twitter, Facebook, Instagram, Snapchat, Reddit and Whatsapp are all huge. Plus there are smaller players like Tumblr, Viber, Telegram and plenty of regional players. The only anti-trust error was allowing Facebook to buy Instagram and Whatsapp. But that was a result of poorly enforcing existing laws not a regulatory gap.