Twitter to open up to third-party data for retargeted ads

Twitter will begin allowing advertisers to target users based on purchases they make elsewhere on the Web, the company announced July 3. The social-networking site said it will serve the ads itself, and users will be able to check a box to opt out of receiving retargeted ads. "It's really just enabling our ad partners to give us data in a privacy-respecting way," said Twitter's senior director of product for revenue, Kevin Weil

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