While initially it seemed Sony’s PSP street chalk drawing campaign in several cities around the U.S. was being well received by some (us), others have dished out a bit of backlash by defacing the drawings and calling for an end to corporations’ attempts to co-op the graffiti art form. AdFreak sums up the issue pointing to a rant over at Gothamist, an online petition to stop the practice and street art blog Wooster Collective’s collection of PSP street art.