StackOverflow is offline (stackoverflow.com)

Hmm, not for me.

curl -I stackoverflow.com HTTP/1.1 200 OK Date: Wed, 13 Jan 2016 14:09:28 GMT Content-Type: text/html; charset=utf-8 Connection: keep-alive Set-Cookie: __cfduid=d2c4c2c1e163203195948c66c50e3c5ec1452694168; expires=Thu, 12-Jan-17 14:09:28 GMT; path=/; domain=.stackoverflow.com; HttpOnly Cache-Control: public, no-cache="Set-Cookie", max-age=33 Expires: Wed, 13 Jan 2016 14:10:02 GMT Last-Modified: Wed, 13 Jan 2016 14:09:02 GMT Vary: * X-Frame-Options: SAMEORIGIN X-Request-Guid: 0a20c4ed-091d-4b25-8b1e-d4715f5d4590 Set-Cookie: prov=d02396ea-3c9b-423f-ae4c-0c95e7d167b9; domain=.stackoverflow.com; expires=Fri, 01-Jan-2055 00:00:00 GMT; path=/; HttpOnly Server: cloudflare-nginx CF-RAY: 2641adda9fa9259d-ORD

ping stackoverflow.com PING stackoverflow.com (104.16.33.249): 56 data bytes 64 bytes from 104.16.33.249: icmp_seq=0 ttl=55 time=11.742 ms 64 bytes from 104.16.33.249: icmp_seq=1 ttl=55 time=10.346 ms 64 bytes from 104.16.33.249: icmp_seq=2 ttl=55 time=9.665 ms 64 bytes from 104.16.33.249: icmp_seq=3 ttl=55 time=9.238 ms

Not for me as well.