Facebook Image dimensions

Hi Friends,

What is the size of the Timeline Cover Photo? What is the recommended upload size of a link thumbnail? How do the dimensions differ for an uploaded image depending upon whether it’s on the Timeline, desktop News Feed, sidebar or mobile? everyone asks this questions many times. Here iam giving you the exact sizes for all facebook image dimensions

Cover Photo   -  851 * 315
Profile Photo  -  180 * 180   Displays as 160* 160
Shared Image - Recommended Upload size 1200*1200