Wow, I've never seen those in real life (I live in Poland). I know most of the results are photos, but I always encountered those in the form of icons, so my brain is still telling me that I'm looking at icons. It's a weird feeling ;)

Certainly a peculiar regional difference, they are ubiquitous in the States. I might not have one in my house, but I grew up around them, they are usually clipped into a clipboard.