We don't yet know what it is but that's what Zuckerberg said on a visit to Facebook offices in Seattle yesterday. He said it was something "awesome" (well it's not like he was going to say it was something sucky) and that the team in Seattle has been working on it. Probably the most reasonable prediction is that there will finally be an official Facebook app for the iPad, something that- preposterously - there has not been so far.

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