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praxis
(slrpnk.net)
The anarchists in my area do this too. It's much appreciated.
The aristocats
Hell yeah brother
Grasweeti - Portmanteau of sweet and graffiti
A community to share pictures of cute graffiti, stickers, wheatpastes and more. Be careful to not dox yourself and if you can, please provide an image description (here are some tips for doing that).