I am watching "maicih" twitter account. Interesting.
Here's an example of an Indonesian entrepreneur, selling hot (potato?) chips, using twitter. The chips are popular and very hot. They scales to measure the hotness.
They have moving vehicles (cars) and selling those hot popular chips in various streets in Bandung (and now other cities). If you want to buy their chips, all you have to do is look at (or follow) their twitter account. You'll know where they are.
As for me, the chips are to hot for my stomach. I'll pass.