Invalid URL "Facebook"

facebook - Invalid URL The requested URL "/", is invalid. Reference #

I can access to facebook using samsung galaxy SII without problem but when try to access to facebook this morning using my laptop, i hit error

Invalid URL

The requested URL "/", is invalid.Reference #9.3e556acb.1337250952.21c9cc69

some suggest that delete browser cache will helps but i hit the above error in google chrome, mozilla firefox and IE8.

You can try 2 ways.

1. Try to flushdns in your computer first.
2. Click on Start
3. Click on Run
4. Type cmd and click on OK button
5. In the command prompt windows, type ipconfig /flushdns and hit enter button.
6. Try to browse the website again.

Not problem not solved, try This

1. Go to folder "C:\Windows\System32\drivers\etc"
2. Open hosts file with notepad .
3. Copy below and paste in hosts file
   69.171.228.74 www.facebook.com
   69.171.228.74 https://www.facebook.com
4. Click on save to save the hosts file
5. Close the browser 
6. Open and access to facebook again.
7. Problem solved.

Ok - If you can't save the HOSTS file try this - it worked like a charm for me! Go to C:\Windows\System32\drivers\etc\hosts
Right Click on HOSTS and click PROPERTIES
Click on SECURITY tab
Select your profile
Click EDIT
then set the security permissions for the file.
Click SAVE
DONE!!