Everybody puts their pictures online. Picasa, flickr, you just name them. But what if your friend puts a picture with YOU on it online? Cue the IDPS (IDentity Protection System), a sticker you wear that “tells” a camera taking a snapshot of you to blur out your face.
(Found at the YaHoo Design week.)

If it works, this may be a good thing, because at the other side of the spectrum, there is Polar Rose, a browser plugin that lets you discover who is in any public photo. They’re in beta right now, but just imagine someone having a picture of you, and then using Polar Rose to find pictures of you all over the internet (even the ones you don’t know of, and/or don’t want others to know about).