[Editor: I got an email this morning from a friend who is working for Jiepang, the leading check-in service in China. Surprisingly, it came with an internal email sent from its founder David (who’s a long-time friend of mine too). Is Check-in business dead? I guess many of you are wondering if service like Foursquare can keep growing as it was expected. I believe in the idea of check-in, but I also think the key to success in the type of business is to adapt to the need of the market as well as the users. Adapt or Die, as David said in this email. I think this rule actually applies to every business, especially for startups in the very crowded mobile internet. So, I decide to publish this letter here (without the consent from David and hope he would not mind), and trust me, it worths your reading and thinking.]

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Gang Lu

Dr. Gang Lu - Founder of TechNode. He's a Blogger, a Geek, a PhD and a Speaker, with passion in Tech, Internet and R'N'R.