One reason for the popularity of Instagram and Hipstamatic is they trigger a collective memory of nostalgia with their patina style filters. Physical world patinas imply changes to a surface through age and exposure. Yet the digital world doesn’t reflect age/exposure in the same way, although it can be manufactured to. Regardless, a picture is worth a thousand words and nostalgia appeals to the masses, so voila, $$.
In the future I imagine digital patinas that are left by dear ones, or better yet me. Kind of like my stamp on the world, my uniqueness, my brand. The more I do something or go somewhere in the digital realm, the more wear and tear it would show on that place. Our marks on public and private places could look different, reflecting who we are in public and private.