Why the Open will win
If only my friends who have accounts in the same service can see my photos or favorite music or restaurants, then I will put less energy into participating in that service. But with a mesh of services connected by common syndication formats and open APIs (Application Programming Interfaces), my friends and I can share and converse amongst ourselves or with the connected world, independent of which tools we use.
For all the services using this open model, this network of tools brings audience. People who share photos, recommend an interesting article, or podcast, or coming event will pull more people into the conversation – a conversation tied to the open mesh of tools.
Any company that sticks to a silo strategy will fail. Instead of the silo communities locking in their users, they will be locked out of the conversation.