I was going to back @yid on his comment, but then I saw the "First batch of app designs are complete"... OMG, this is a complete rip-off. How can we be sure it

I was going to back @yid on his comment, but then I saw the "First batch of app designs are complete"... OMG, this is a complete rip-off. How can we be sure it was you who designed those mockups? Sorry, but it just seems unbelievably strange that a company like Foursquare would act in this way.