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1) JSON for everything. Want to leave? Download your profile in a text file. 2) Make it like email. Every item has a "to" list. Nothing outside the list can se
by Raphael 16y ago
1) JSON for everything. Want to leave? Download your profile in a text file.
2) Make it like email. Every item has a "to" list. Nothing outside the list can see.
3) pubsubhubbub or webhooks.
4) OK.
5,6) Difficult to impossible.