That Rocks But Not In National Parks

So there is a new thing. Sort of new. This is a rock. It is a nice smooth rock. somebody took the care to paint it and hide it in a well trafficked location where someone (me) would find it. there are instructions on the back to post it to FB. The idea being that this rock will travel the world being shared by various travelers. Delightful idea. Please don't hide them in national parks. It does count as littering. 
For some reason I found four of these things this summer while the rest of my crew only found one.