The 1996 article I mentioned. (Later, a book, and a website that has some reaction to more recent developments.) Some prescience in there:
"The devices will get tinier, more mobile, and more clever. In software form, they will cruise the data highways. The rich, the powerful, police agencies, and a technologically skilled élite will always be able to find out whatever they want to know about you and me."
Brin's excellent novels include Startide Rising, Earth, and The Practice Effect. At least, that's what I remember.