A ping to facebook returns a different IP address.
Pinging facebook.com [66.220.156.68] with 32 bytes of data:
Reply from 66.220.156.68: bytes=32 time=297ms TTL=77
Reply from 66.220.156.68: bytes=32 time=321ms TTL=77
Reply from 66.220.156.68: bytes=32 time=257ms TTL=77
Reply from 66.220.156.68: bytes=32 time=262ms TTL=77
Ping statistics for 66.220.156.68:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 257ms, Maximum = 321ms, Average = 284ms
Pinging facebook.com [66.220.156.68] with 32 bytes of data:
Reply from 66.220.156.68: bytes=32 time=297ms TTL=77
Reply from 66.220.156.68: bytes=32 time=321ms TTL=77
Reply from 66.220.156.68: bytes=32 time=257ms TTL=77
Reply from 66.220.156.68: bytes=32 time=262ms TTL=77
Ping statistics for 66.220.156.68:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 257ms, Maximum = 321ms, Average = 284ms