The mention of graffiti in any geospatial context reminds me of the April Fool's day
news release in 2008. This news, was then considered a joke and I had cautioned all vandals about the 24X7 graffiti monitoring capability of this technology ; ) . The geeks at earthmine inc. seem to have taken this idea seriously and have offered all the graffiti artists as well as vandals a free hand at virtual art on walls in virtual cities. The possibilities are endless - virtual poll campaigns, product advertisements, bill boards - all on virtual walls of virtual cities representing real cities...
In most countries, painting graffiti on walls without the property owner's consent is an offense and considered as an act of vandalism. It would be interesting to see the evolution of a law and code of conduct in these virtual cityscapes with real punishments meted out to real offenders for virtual offenses in a virtual world. We could also have 'wanted' and 'missing person' posters in virtual alleys...