A gruesome British public service video that portrays a fatal accident caused by a texting teenage driver has been the talk of Facebook and other places where young Americans congregate, but a new study suggests it hasn't done much to change their habits.

A quarter of U.S. teens say they text while driving. and almost half say they've been in cars with a fellow teen who sent text messages while behind the wheel. They say their parents are texting fanatics, too.

The findings come from a phone survey and focus groups that the Pew Research Center's Internet & American Life Project released Monday.

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"Many teens understand the risks of texting behind the wheel," said Amanda Lenhart, co-author of the Pew report, "but the desire to stay connected is so strong for teens and their parents that safety sometimes takes a back seat to staying in touch with friends and family."

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