Facebook bought an AI startup that could turn its middling virtual assistant into a Siri killer (FB)

Facebook's virtual assistant, which goes by the name of M, hasn't quite delivered on the promise of a life-changing artificial intelligence product.
But Facebook isn't giving up. On Monday, the company announced its acquisition of a small, AI startup that will be folded into Facebook's messaging app.  Ozlo, which was founded four years ago and is based in Palo Alto, California, describes itself as "an index of knowledge about the real world."
In practice, that means a technology that l