iPhone filmmaking

This article was about one director utilizing camera phones, webcams, and other devices to film parts of his movie. From this article I learned that the 70- year old director is using this cameras and such to make footage that looks it were "Found". I also learned that he's making some of the footage look believable that it was filmed, such as people at a party before the main part of the movie begins. and I learned that there's also irony in the film that is caused by the technology used. A thing I like about this article is that it shows how much these new devices have made an impact on our lives. Another thing I like about this article is that it shows how movies are now made more believable than before. A question I have about this article is, haven't a lot of movies done this already?