What's Facebook up to With Android?

Photograph by Josep Lago/AFP via Getty Images
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Facebook’s forthcoming Android announcement on April 4, whatever it may be, is an indication of one thing: For all its successes on the Web, the company’s mobile future is far less certain.

We don’t really know what Facebook is going to unveil on Thursday, but there are some things we do know, and they are true today, Thursday, and after Thursday: