These copy cat sites (and similar ones in Europe) are an interesting test to the "idea" vs. "execution" argument. I bet that there are other nearly perfect clones of Tumblr in China yet this one has risen to the top. I'm sure Kai-Fu Lee is looking beyond the ideas and at teams behind them.

Cloning might not be the most ethical way of building a product but clearly DianDian identified a market that wasn't being served in China and had the ability to bring a product to that market.

I love that the discussion of cloning was happening on "Zhihu, a clone of Quora".