more myths.the person in Chaplin movie, well how can u be so sure he is holding a phone? could be anything he put to his ear.the other picture, well look at his glasses, bulky and large not mordern. look at his large camera, doesnt look like a digital camera. his clothes although unusual, not impossible for the time. only if u had cared to do some research on those pics/videos.as for why no future person has visited us i really do not know, but 1] its possible if string theory is correct, everytime we speed up time, we enter a new universe or a new universe is created.2] maybe they dont want to scare us or it has some moral implications, like how cloning has been restricted due to its moral implications