Facebook Cover Photo Dimensions
Facebook Profile Picture Size
Facebook Fan Page Tab Images (Thumbnails)
The Tab Images, or Thumbnails that appear under your Cover Photo, are 111px wide by 74px high. Keep them simple – maybe just type that expresses a call-to-action.
Facebook Fan Page Tab Favicon
Facebook Fan Page Tabs
Facebook Wall Photo Size
Facebook Photo Viewer Photo Size
Photos you’ve uploaded will appear in the Photo Viewer, or lightbox, at the size you uploaded them, up to 960px x 960px. Themaximum Facebook photo size for upload and download is 2048px square. If you upload a larger image, Facebook will reduce it so the longest side is 2048px, but it will appear in the Photo Viewer no larger than 960px on the longest side. It can be downloaded at the full size, however.
WARNING: Photos you upload to Facebook can be downloaded by anyone you’ve allowed to view them in your permissions. Any images could thus be reused, even though this is a copyright infringement (unless you have given permission). How to Report Claims of Intellectual Property Infringement