Joe Sixpack has one question: WTF you are talking about, who is centralized, and why should I care? Seriously, geeks are 1% of Facebook audience, 99% couldn't care less about "decentralization".
This^, despite the fact that I do understand the article and appreciate the concepts. Diaspora would never fly because ten nerds (and zero women) would not constitute a user base. Even Google+ has a user base of mostly nerds that keep it active. There (apparently) has to be a SN for utter dipshits, and that's the role that FB fulfills.
Correct. It is illegial for police to take your phone, or any property without a signed warrant (for the US).
Do not give them up - even if the ask nicely. You can volenter to give them a copy of the photos or video if you wish - but you are certainly under no obligation to do so - just because they tell you to. Just be polite, and tell them you will be happy to comply when they produce a signed warrant for said property. They will mumble and then give up in most cases.
Sheep get pushed around and abused - stand up for your rights people!
From your _person_? Police do that all the time. I believe the term they would use is "confiscate."
Open Carry in a state with lax gun laws and see if the police don't confiscate your weapon without a warrant. Similarly, go photograph your nearest federal building with a big SLR and see how long before they take it.
Telling them they need a warrant is another way of asking to be arrested (for resisting arrest, no doubt). In the US cops have been able to beat people to death without any real repercussions.
Take an astronaut to launch.