"Global Walls" is an online application addressed to the street artists.The main mission of this application is to unite all the street artists around the world, as this kind of communication, especially if it is supported by visual material, leads to inspiration for new ideas, which incarnate the engine of cultural development. In order to raise users' interest a star-rating competitive element has been integrated into the application. Star ratings provide competition for a place in the ranking table that adds excitement to the overall picture. This factor, in return, implements the scheme 'between communication & contention' by putting user to choose between finding new like-minded friends or competing with them.