The MTA isn’t a fan of “advertising that lends itself to vandalize the system,” but they also don’t seem to be in a position to turn down ad dollars, which might explain how Mad Men (well the agency that booked the media space) pulled off running its current minimalist campaign.

It’s begging to be written on and that’s exactly what people have been doing, even Occupy Wall Street supporters. What a great concept: Brand communication through vandalism. (Photo: @CarrieM213)