Lawmaker Wants FTC to Probe Online Ad Companies

A lawmaker has asked the Federal Trade Commission to investigate online ad companies that track consumers across devices, like showing them ads on their phones based on Web sites they visit on a computer. The letter, sent by Senator Edward J. Markey, Democrat of Massachusetts, to Edith Ramirez, the commission’s chairwoman, cited a New York Times article detailing the new ways that mobile advertisers are tracking consumers, including across devices.