well some writers do hit the nail on the head, one of the early bond movies had a GPS in his car. So did kit in knight rider. Oh and while weare by kit self driving cars are being invented now. The un invasive medical scanners from star treck well magnetic imaging comes to mind used worldwide not that portable as of yet tough
George Orwell wrote a book about a world where people are being watched by others on telescreens and nobody knows when and where tghey are being watched sound familiar cameras everywhere big brother is always watching
someone said for predictions of the Internet well i think mark twain did it 100 years ago.