Only my Facebook page is not opening? Facebook is not working on my PC? How to open dns block facebook? PTCL Broadband having an issue with Facebook? Are you experiencing such kind of issues? Take a look at this article, It may help you solving your issue.
1) First delete the cookies, recent history etc from your browsers. For Firefox : Hold the "Ctrl and Shift" keys and press the "Delete" key. "Clear Recent History" will be opened. In "Time range to clear", select "Everything" from the drop-down menu. Now select all the options under "Details" and click on "Clear Now".
For Chrome : Hold the "Ctrl and Shift" keys and press the "Delete" key. "Clear Browsing Data" will be opened. For "Obliterate the following items from:" select "the beginning of time" from the drop-down menu and select all the options. Now click on "Clear Browsing Data".
For Internet Explorer :