The operative phrase in that last one is "for logged‑in members", because in that case the cookies fall under the earlier provider of an information society se

The operative phrase in that last one is "for logged‑in members", because in that case the cookies fall under the earlier provider of an information society service explicitly required by the user to provide that service. For a user logged-in to a social network, the user clearly consents to the social network providing a service. Note that it is not allowed if the user is not logged in to the social network.