Marks of the Spider-Man are graffiti symbols that can be seen along the buildings of Manhattan in the movie and video game that Spider-Man appears in. They are created, obviously, to support Spidey and his cause.
To promote The Amazing Spider-Man film further, Sony Pictures Entertainment released a small website to get fans deeper in the action. The site shows pictures of people spray-painting Marks on buildings, making long, thread-like webs, etc. all to promote the movie and support the fictional Spider-Man.
Marks of the Spider-Man found in the video game are for a different reason; while there may be few Marks out there still supporting the hero, most of the Marks are for the player to find, take a picture of, and collect a certain suit.
- To promote the movie and make it "bigger", Sony projected holographic marks over famous world buildings.