I wish people would quit assuming my interest in decentralization is based on privacy concerns. There are lots of things that are much higher priorities:
• Censorship resistance.
• Resilience. An entire library of content/social graph isn't destroyed because of a change in corporate focus.
• Evolution. Protocols can change more when not under a single administrative domain of control, and in ways that meet the interests of user communities rather than productization committees.
• Flexibility. Since things are decentralized anyway, it's much harder for the system to ossify in a way that relies on one particular family of devices.
• Namespacing. Being able to 'reserve your brand' across all social graphs is an antifeature.