From the article, it looks like Digg is plateauing. Consequently, they probably want to expand and are looking for cash infusion. Or more cynically, managemen

From the article, it looks like Digg is plateauing. Consequently, they probably want to expand and are looking for cash infusion. Or more cynically, management is looking for some way to monetize their current shares without an IPO or buyout in the near future.