In researching web performance DNS configurations issues are common problem. It is usually related to www.foo.com and foo.com being configured differently. This seems to be at a high level the issue with facebook.com. if you go to "facebook.com" the DNS will resolve correctly, but it will redirect you to www.facebook.com. I guess they could stop the redirection and fix the problem immediately, or wait till the sorry.ak.facebook.com.edgesuite.net is fixed.

=====www.facebook.com

new-host-3:dpu2 robertbuffone$ dig -trace www.facebook.com ;; Warning, ignoring invalid type race

; <<>> DiG 9.6.0-APPLE-P2 <<>> -trace www.facebook.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19626 ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION: ;www.facebook.com. IN A

;; ANSWER SECTION: www.facebook.com. 0 IN CNAME sorry.ak.facebook.com.edgesuite.net. sorry.ak.facebook.com.edgesuite.net. 0 IN CNAME a1030.g.akamai.net. a1030.g.akamai.net. 4 IN A 63.84.59.59 a1030.g.akamai.net. 4 IN A 63.84.59.10

;; Query time: 10 msec ;; SERVER: 198.6.1.142#53(198.6.1.142) ;; WHEN: Thu Sep 23 16:57:29 2010 ;; MSG SIZE rcvd: 144

========facebook.com

new-host-3:dpu2 robertbuffone$ dig -trace facebook.com ;; Warning, ignoring invalid type race

; <<>> DiG 9.6.0-APPLE-P2 <<>> -trace facebook.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19984 ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION: ;facebook.com. IN A

;; ANSWER SECTION: facebook.com. 352 IN A 69.63.181.12 facebook.com. 352 IN A 69.63.189.16 facebook.com. 352 IN A 69.63.189.11

;; Query time: 13 msec ;; SERVER: 198.6.1.142#53(198.6.1.142) ;; WHEN: Thu Sep 23 16:57:44 2010 ;; MSG SIZE rcvd: 78