I was listening to This Week In Google driving home yesterday. Leo, Gina, Jeff, and Kevin were talking about how the Internet never forgets; once something is posted, like a photo or a comment, it's there forever. This topic is at 28m 30s into the show.

When somebody stumbles upon historical data, they don't necessarily know whether the information is current. For example, say a 20-year-old is in a relationship and the two have uploaded photos to sharing services. In a couple years, the two may have gone their separate ways, but the old photos still show them together. I'm sure most people don't consider this a problem. However, what if there was an application that would periodically login to your photo sharing services and apply some digital aging to the photos. Anybody browsing the photos would have visual feedback that the image is a little bit dated. Of course, there are a bunch of phone applications that create images that appear to have been taken with old film and printed on nostalgic paper. That throws a bit of a monkey wrench into what it means to artificially age a digital image. Maybe they could fade away like the McFly children in Back to the Future.

Then again, most people wouldn't want a 'bot to be messing with their family photos. :P