We need a simple photo app that uploads user selected displayed pictures from our our custom User Interface App that was built with C# in Windows and our Cocoa# in Mac to Facebook, Twitter and Instagram.
1) User will have 3 options of Facebook, Twitter and Instagram that user can choose which social network they want to load the picture.
2) If you press any button such as FB or TW or Instagram, it uploads the displayed photo into their user's album account on FB, TW, of Instagram.
3) Use Facebook API to develop if needed.
Very important - The app must run or work on both Windows and Mac - DO NOT BID IF YOU CAN'T MAKE IT WORK ON BOTH PLATFORM.
Our user interface was designed in C# in Windows and Cocoa for Mac.
PM for details.