Kai Ryssdal: This final note today. in which we go back to whence we started, Facebook buying Instagram for a billion dollars. It is, as Facebook's Mark Zuckerberg said in a blog post today, essentially a social networking deal. So it seems fair to ask social networkers what they think of it. That's what the Wall Street Journal did that today, a snap online poll. Suffice it to say Mr. Zuckerberg has some hearts and minds to convince.

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