Is Dark Matter Made of Tiny Black Holes?

Is Dark Matter Made of Tiny Black Holes?
A planet-hunting NASA spacecraft has detected no sign of moon-size black holes yet in the Milky Way galaxy, limiting the chances that such objects could make up most of the “dark matter” that has mystified scientists for decades.

Dark matter is one of the greatest scientific mysteries known — an invisible substance thought to constitute up five-sixths of all matter in the universe. It remains so mysterious that scientists are still uncertain as to whether dark matter is made of microscopic particles or far larger objects.

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http://www.space.com/23583-dark-matter-tiny-black-holes.html