This is an interesting application of social communications to detect and alert swimmers of Shark activity in Australia.
Australians fight shark attacks with Google+ and ‘clever buoys’
As a young boy on Long Island, I spent many a summer at Robert Moses beach. With the exception of the occasional jellyfish sting, it was very safe. Unfortunately, a child’s imagination can be rather powerful. After seeing the movie Jaws, I would become frightened when the seaweed would rub against me. Even though it was only a plant hitting my leg, in my mind, I pictured a ferocious shark.