Comment Firewall their IP addresses (Score 3, Informative) 92
Depending which part of the planet you're in, most of your FB tracking attempts will come from one of the blocks below. Firewall them all to be safe.
31.13.24.0 - 31.13.31.255
31.13.24.0/21
IE-FACEBOOK-20110418
Facebook Ireland Ltd
IE
31.13.64.0 - 31.13.127.255
31.13.64.0/18
IE-FACEBOOK-20110418
Facebook Ireland Ltd
IE
66.220.144.0 - 66.220.159.255
66.220.144.0/20
Facebook, Inc.
THEFA-3
69.63.176.0 - 69.63.191.255
69.63.176.0/20
Facebook, Inc.
THEFA-3
69.171.224.0 - 69.171.255.255
69.171.224.0/19
Facebook, Inc.
THEFA-3
74.119.76.0 - 74.119.79.255
74.119.76.0/22
Facebook, Inc.
THEFA-3
103.4.96.0 - 103.4.99.255
103.4.96.0/22
FACEBOOK-SG
173.252.64.0 - 173.252.127.255
173.252.64.0/18
AS32934
FACEBOOK-INC
204.15.20.0 - 204.15.23.255
204.15.20.0/22
Facebook, Inc.
THEFA-3