Google is soliciting help from U.S. communities to build ultrahigh-speed broadband networks that zip 1 gigabit of data per second to users' computers, according to the Wall Street Journal . Google plans to test the networks for anywhere from 50,000 to 500,000 users. The idea is to help stimulate the creation and use of new applications, such as streaming high-definition video content and real-time multimedia collaboration. But Google has no experience in this arena,