i think @daveid's point is common, and i haven't actually read anything by Brin on the matter so i don't know what counterpoint he might make. maybe tracking itself would be tracked? maybe person X is watching you watch person Y? i think in general, however, with that much information, people will simply not care what everyone else is doing. part of what makes "private" information interesting is its rarity.

and i don't think anyone claims it wouldn't be a different culture, or that we should throw away core privacy like being able to sleep in our own beds without someone watching