Pizap is a tremendously popular Facebook photo app for fun photo editing with over 3 million fans. The success secret is simple: Pizap helps to edit pictures easily and post them directly to your Facebook online album.
Although the application is absolutely free, it is surprisingly feature-rich. Pizap lets create collages with friends, edit photos, delete image background and add photo frames. Login to Facebook, install Pizap photo editor and start editing your pictures.