The yfrog pic may have been copied from this thread.
Call me a cynic, but I need more information.
The yfrog image is not copied from the one on this thread. The photobucket image is 52 kilobytes & 640X480 pixels. The yfrog one is 180 kilobytes and 768X1024 kilobytes, and does not appear to have been upsized, as the point of focus is the woman in the foreground with the heart on her cheek. There's more detail in the area where the sun strikes her cap in the yfrog image and the smaller image shows more artifacting when they are zoomed to the same size. This means if one source copied the other, the photobucket photo was probably copied from the larger yfrog image. However, the camera EXIF has been stripped from both images.
I'm not finding the photo on Google search, but searching photos is tougher than searching text. It doesn't appear photoshopped to me, but scaling for the web introduces it's own artifacts and hides photoshopping. The signs clearly put the location as the current demonstration, and makes it far less likely this is an old demonstration photo being passed off as a new one.
My gut tells me it's legit, but I'd still like to get info on who took it, or at least a camera EXIF to prove it hasn't been shopped.