An earlier study showed that the onset of precopulatory behavior, or tube-sharing , in the amphipod crustacean Microdeutopus gryllotalpa (Costa) generally. YouTube is an American video-sharing website headquartered in San Bruno, California. . The site's owner, Universal Tube & Rollform Equipment, filed a lawsuit against YouTube in November after being regularly overloaded by people. The hookah pipe is an ancient tool for smoking tobacco and is a growing public health concern at the global level. YouTube is a website that allows its members .