Don't be surprised then to suddenly see an advertisement on flight deals between those two places. It's what United Airlines did with an ad on Yahoo earlier this year as people browsed for something completely unrelated to travel.
Elsewhere, online hangout Facebook is mining friends' buying habits, and major Internet portals have bought companies to expand their reach and capabilities for "behavioral targeting" -- all so advertisers can try to hit you with what they believe you're most likely to buy, even as doing so means amassing more data on you.
"When you are online today, you've been labeled and tagged as this type of consumer in milliseconds," said Jeff Chester, executive director of the Center for Digital Democracy. "All of a sudden you are exposed to a vast number of invisible salespeople who are peering over your personal details to figure out the best way to sell to you."
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