Fidelity and T. Rowe Price, which invested $50 million in a 9.1% stake in San Francisco-based startup Slide, are among those banking on the firm's widgets as a key to reaping the full ad potential from the social-networking space, according to this article. "The metrics for success are going to shift away from who can provide the most reach toward who is paid the most attention," said Slide CEO Max Levchin.

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