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.