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Who's next?

The ink is barely dry on Facebook's $1 billion deal to buy photo-sharing service Instagram, yet the latest parlor game in Silicon Valley is who might be next on Facebook's shopping list.

The short list is a hodgepodge of familiar names and up-and-coming start-ups, ranging from music service Spotify to voice-over-Internet-protocol firm Insta Telecom, according to tech executives, analysts and venture capitalists.