It's not clear what those proposals really mean. But even if Vodafone were sending a constant stream of IP->subscriber mappings to GCHQ then GCHQ would have to

It's not clear what those proposals really mean. But even if Vodafone were sending a constant stream of IP->subscriber mappings to GCHQ then GCHQ would have to send them on to Facebook/Google/Yahoo etc. in close to real time in order to get what they're after.