Indeed, the dinitsateon is us. But that in no way justifies network fragmentation. The whole point of internetworking is to link all nodes regardless of their nature, and we – the users – should not tolerate being fenced in. The walled gardens may bring short term rewards (all the girls are on Facebook, so even I have an account there…) but the younger generation should be reminded of how we suffered in the age of the BBS and what a liberation Internet connectivity has been. Whether a walled garden is accessible from my mobile communicator is irrelevant : what matters is the free movement of data.I concur with John Bredehoft that email is the canonical example of an open service : it does not matter who provides the service to you, it is fully interoperable with everyone else and you can change provider easily. There is no reason to settle for anything else. Open and decentralized social media tools appear and the users will adopt them as they begin to understand where their interests are.