Each urban triumph paves the way for future legalization in other places. San Francisco, the home where Airbnb matured through a rocky adolescence, is no small step on the road to mainstream acceptance. The implications for San Francisco’s Airbnb legalization aren’t clear-cut. Perhaps it will make some cities more likely to consider passing laws in apartment sharing’s favor. San Francisco has willingly offered itself up as a testing ground. The rest of the world can watch and see – does legalizing Airbnb in this way hurt the city and raise rents by limiting available living spaces? Or does it give current residents a much-needed cash flow, encourage tourism, and raise more money for the city through the hotel tax? With a framework to follow, legalizing apartment sharing looks like less of a daunting challenge. Get the full story at GigaOM