Using stickers as graffiti is nothing new (the artist known as "BNE" got famous that way).
But I've noticed more and more SoMa taggers using "Hello, my name is..." stickers lately.
Here's one on a bicycle rack on Fourth Street near Folsom.
I also spotted a cluster of them at our neighborhood playground...
...and on our well-decorated (if defunct) ATM around the corner.
Whether you think this is art or vandalism, at least they're fairly easy to peel off.