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."