Unable to open my facebook page

Hello,

firstly .
Adding " s " did not work for me
all sites are opening perfectly! and when i open facebook.com only-it shows

Unable to connect to the Internet
" chrome cannot find the server "

i tried logging in through CHROME,INTERNET EXPLORER none worked

is this a virus that blocks only the facebook ..??
every thing was fine before 2 days..
i have cleared my chache as by now, also downloading firefox in the mean while


plszzzzzzzzzzzzzzzzzzzzz help me fixing this issue... plzzz plzzz help me... m damn frustrated now friends