My $0.02 is that: If you're using Google Analytics to track visitors, you need their permission beforehand. If you're tracking visitors uniquely so that click

My $0.02 is that: If you're using Google Analytics to track visitors, you need their permission beforehand. If you're tracking visitors uniquely so that click-throughs to merchants earn you revenue via affiliate schemes, you need their permission for that, too. See https://law.stackexchange.com/questions/82133/are-auto-generated-identifiers-pii-if-they-cannot-be-linked-to-an-identity https://law.stackexchange.com/questions/82133/are-auto-gener...