Leave a note with Graffitio

To post to Graffitio, open the app. Pick a  "wall"-—a conversation thread—or tap the + icon to create a new one. Scroll down to see what people have been saying for the past few minutes. Tap the box-and-pencil icon and enter your text. Tap Post and you're clone. For now, the walls aren't technically pegged to a particular place—not via GPS, anyway. But you can name a wall after a place and hope people will find it that way.