I keep getting (safari can't verify the identity of the website "static.ak.facebook.com" on a few forum sites

Check the time and date are correct and being updated to your location in system preferences

You know facebook tracks you when you log out right? it's these things that are doing this

Facebook changes it's cookies when you log out, so then on websites they can track you

http://www.zdnet.com/blog/facebook/facebook-tracks-you-online-even-after-you-log -out/4034

My time and date setting are all correct. Still having the same issues on 4 out of 4 of my mac products - all using the latest OS.