Facebook

When the Facebook pixel tracking is implemented on you website, two cookies is set:

• "_fbp" is used to distinguish and keep track of your unique users
• "_fbc" is only set when a user arrives at your website from an Ad and the destination URL includes the click identifier "fbclid"

Both cookies are auto updated/extended by Facebook with a default expiration of 90 days. As auto update/extend can not be disabled, backup cookies will be required. This is the default setting of Cookie Saver. 

Configuration to be added with the Cookie Saver installation:

acq("addCookie", {
  "name": "_fbp",
  "expirationDays": 90
});
acq("addCookie", {
 "name": "_fbc",
 "expirationDays": 90
});