OSM has implemented a feedback tool for its map not unlike
ArticleFeedback (allowing for anonymous submission):
It's not as prominent which mitigates the noise somewhat, but I'm
seeing a few spammy notes already, as well. ;) To see notes you have
to have the "Browse Notes" checkbox ticked in the Layers icon (top
right corner), and to add notes you have to click the tiny "Add a
note" link in the bottom right.
VP of Engineering and Product Development, Wikimedia Foundation