some website not loading up (mac)

It has been a common problem now a days that many websites are not loading up and blue bar does not fill u p .Some common websites like google.com , facebook.com also does not load. I had the same problem and searched many places for solution but didn't get any solution for mac. Finally i did some troubleshooting steps myself and it actually worked. 
Here are the steps to be followed

STEP 1 :-
1) Open terminal (by searching in the spotligth or under apple icon at the top ) .
2)Enter following code 
    OS X Mountain Lion or Lion or Mavericks
    Use the following Terminal command to reset the DNS cache:

sudo killall -HUP mDNSResponder

    Mac OS X v10.6

    Use the following Terminal command to reset the DNS cache:

sudo dscacheutil -flushcache
3)Press enter key or return key.

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STEP 2 :-
1)Open finder and click on go in the right top menu and click on OPTION key  .
2) Open library from that .
3) In that delete following folder contents Caches, logs,cookies and delete them.
4) Open preferences and find  
com.apple.systempreferences.plist 
 and delete it .      

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STEP 3 :-
1) Open SYSTEM PREFEERENCES and go to network tab.
2)At the click on arrow mark near to the LOCATION .
3)In that click on "+" and create a new location.
4)Apply the settings.
5) Customise the new location.