[Sgt.Stubby]

All the sites mentioned so far are walled-gardens with compulsory registration, and most of them are censorship-prone.

Phandroid in particular - lots of hostility, and power tripping mods. Also, you're looking for privacy and security, but the phandroid crowd's philosophy is along the lines of --> if you need privacy you must be paranoid and you're probably doing something nefarious.

I suggest the usenet newsgroup comp.mobile.android. There is no censorship there, no registration, and no spam. You can post freely from an open nntp server like aioe.org, for example, or you can post anonymously using mixmaster.