You may not know about Rocket Internet — the Berlin-based entrepreneurial incubator — but it knows quite a bit about US startups. Rocket Internet takes the fresh ideas from Silicon Valley and elsewhere around the world and "executes" on those services in local markets spanning across 58 countries. GigaOM has published a piece exploring the sprawling reach of the Samwer brother's internet empire, including Zappos clone Zalando, eHarmony clone eDarling, and more. If you've ever been curious about the seedy underbelly of the startup world, GigaOM has all the details.