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Yahoo to YouTube Ads Spreading Viruses Rile Lawmakers

The $43 billion online-advertising network built by companies like Yahoo! Inc. and Google Inc. is jeopardizing consumer privacy and giving hackers an easy path to infect computers, a U.S. congressional investigation found.

Now, armed with a better understanding of the opaque mechanics of Web ads, Senator Carl Levin and other lawmakers are asking whether stricter rules are needed to protect consumers, setting up a battle with companies that shaped the Internet.