First thought its a network problem but it isn't everything is fine.
My system is is fully updated, flash and java all up to date.
Just did a clean install of Ubuntu 12.04 every thing was fine, updated my system from the update manager, restarted it then after that. Now pages like FACEBOOK(after log in),YAHOO,PICMONKEY,HOTMAIL etc don't load at all and comments section and certain other parts of pages like aas, omgubuntu.com, makeuseof.com, etc keep on loading but don't load.
Google search is loading as usual but results are not opening and pages keep loading.
Found a similar question here but didnt get any help