When "The Net" was first being advertised, the ads made it look ridiculous. Then, when I saw it, it was actually quite good. Angela Bennett (Sandra Bullock) spends her days working on the computer and has never gotten to know her neighbors. Then, through a series of events, her identity gets erased by a cabal of shadowy people, and she can't prove that she exists.
Some parts of the movie are a little bit far-fetched; you'd probably know which parts if you saw the movie. Still, it's a good look into what the existence of the Internet may have wrought on unsuspecting people. I do recommend it.