When a food truck started driving around Los Angeles last fall serving Korean BBQ -- in tortillas -- it set off a food frenzy. Kogi Korean BBQ announced its locations using Twitter, winning national media attention, more than 40,000 followers and triggering a new culinary craze in the process. In San Francisco, it seems like a new renegade food cart hits the streets every week. We take to the streets to sample some of the latest mobile food offerings.
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