Not sure what happened... But as of this morning, my macbook air can't access Facebook. Everything else works fine. I've read a 100 threads of similar issues. I've tried... 1) Adjusting MTUs manually 2) Reinstalling Mounting Lion 3) Flushing DNS 4) Created a New User 5) Created new network locations 6) reset airport extreme Nothing seems to be work. Other computers at home work just fine. iMac connected wireless works. iPhones/iPads work. Any ideas?