http://www.betanews.com/article/Google-opens-Map-Maker-crowdsourced-mapping-for-US/1303251104
"Users submit map edits which are then reviewed and posted by Google's own editorial staff. Google says the edits should appear within a few minutes of submission, and edits can be tracked in realtime in Google Earth."
So Google gets input from its users, which Google first reviews before putting online. This I would assume is the best way, to avoid the trolls directing today's soccer fans into a canal instead of the stadium.
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