I use Ubuntu 13.04 OS and when I install Google Chrome and Firefox and open Facebook for the first 2 days it works perfect, and suddenly some images don't appear like my friends profile pictures or shared photos while others appear, this is a print screen.
This problem occurs with facebook only.
How can I solve it?
Shift + F5
to force reload all the contents. Another problem might be DNS issues - try using a different DNS (Google or OpenDNS) - see this question on how to do that - What is the proper way to change the DNS IP?