President Barack Obama's re-election campaign recently paid $5,000 to BrightTag, an advertising-tech company that helps websites manage third-party tags from ad partners, analytics firms and social networks. BrightTag's technology makes it easier for the Obama camp to target ads to potential donors and activists based on their browsing history. "The BrightTag payments are a handy reminder that corporate marketers aren't the only ones collecting user data," writes Kate Kaye.

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