3.  Facebook
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Facebook (FB) can crow about not just one, but three huge social platforms. Facebook is the world's largest social network. Its two acquisitions -- Instagram and WhatsApp -- are also growing fast. That's why Morgan Stanley argues Facebook has an "enormous opportunity" to capture a growing chunk of digital ad dollars in the future.

Related: Facebook to beam free internet to Africa with satellites

First published November 18, 2015: 10:52 AM ET

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