i can't access Facebook

Hey there KMBISHARA,

It sounds like you are unable to load 2 websites in particular after updating Safari. I recommend trying the steps in the following article named:

Safari 6 (OS X Mountain Lion): If Safari can’t open a website

http://support.apple.com/kb/PH11883

Reload the page and reset Safari

1. Open Safari if it is not already open.
2. Choose View > Reload Page.
3. If reloading the page doesn’t work, choose Safari > Reset Safari, click Reset, and then try again to open the page.Warning: Resetting Safari deletes your browsing history and much other information. To learn more, see this help topic:Reset Safari

Check your proxy settings

If your computer or network is protected by a proxy or firewall, be sure your settings are correct in Network preferences. Incorrect settings can prevent Safari from connecting to some websites.

1. To enter proxy settings, choose Apple menu > System Preferences, click Network, and then click the Advanced button.
2. In the Advanced pane click Proxies.For information about settings in the Proxies pane of Network preferences, click the Help button (looks like a question mark).

Contact the website’s owner

• The webpage may prevent users from accessing the page using Safari. Check with the website owner to find out for sure.
• Ask the website owner if the first part of the address, which identifies the Internet protocol (such as http or https), is nonstandard. If it is nonstandard, Safari can’t open it.
• Ask the website owner if there’s a problem with the web server’s configuration.

Use the latest version of Safari

To update your software, choose Apple menu > Software Update or Apple menu > App Store.

Thank you for using Apple Support Communities.

All the very best,

Sterling

Dear all,

try to disable IPv6 in networks settings. That helped me.