This blog post that did some investigation on that photograph quite clearly shows that it is a photoshop job. Furthermore, the originator of the photoshop job has as much admitted to it being photoshop, and he did it to bring attention to the movement, even though he is not involved in it.
> “yes its photoshopped I was hyping the event lol you do know the news is lying to us all day long. So they have CNN and Fox the 99% have me lol
>
> Sincerely,
>
> Jason Wettstein”
If you peruse the two blog posts (I know, not the most reliable sources), they do a lot of research for us. They link to the original photographs from google and highlight how the photoshop was done.