In next few days everybody using facebook gonna see images you share slight bigger and faster. Today Facebook said that
" Sharing photos is one of the most popular activities on its social network. Users upload more than 250 million photos each day. the photos you share on Facebook are bigger (720 pixels to 960 pixels) and load twice as fast, giving you quicker access to more detailed images. Photos you've already uploaded to your profile will also be displayed at this higher resolution. "
It also said about the Focus on the Photo --
" Today, we are rolling out a more streamlined photo viewer that features a cleaner interface that makes it even easier to enjoy your photos. The light box is now set against a simple white background that puts more of the focus on the photo, and less on the surrounding frame."