Systems and methods of monitoring online activity may include providing, by a server of a linking system, a cookie of the linking system to a client device responsive to receiving a first request from a first resource to access a first link encoded by the linking system and linked to a second resource. The server may identify from the first request, the cookie, the first resource and the second resource. The server may receive from the client device, a second request to access a second link that is encoded by the linking system and linked to a third resource. The server may identify from the second request, the same cookie provided to the client device and the third resource. The server may identify, via the cookie provided to the client device, that the client device has accessed the first, second and third resources.