I'd like to give as much helpful criticism as possible, but I can't say much about the general idea, doesn't ring with me, but I'm not a photo/sharing social media person so I'm not the target audience here. Otherwise, I would try to get a native english speaker to correct the english mistakes, that always takes a bit away from the professionality of an app. Also IMO I think bootstrap is too ubiquitous (don't know if end-users think this yet), doesn't add any unique/cool feel to your idea that a good design might. The fact that about/contact/blog all link to a completely different looking site is confusing and disorienting, you might want to consider taking them out.
Best of luck with the idea though - always glad to see people making things :)