The number of homes in the United States with private security cameras increased by about 5 million last year, to 15 million homes, according to Parks Associates, a research company. A similar increase is expected this year, said Tom Kerber, Parks' director of research.

People have found use for the cameras for “monitoring their pets, the nanny or their kids, so much more besides security,” he said. New features like facial recognition should increase the popularity, he said.

From the article, "NEW: Webcams see all, including a tortoise-eye view of a pet store" by Quentin Hardy.

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