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Bike－sharing has taken off in China far faster than in any other market.The market has become flooded with new companies in recent months.The bike－sharing companies operate in a similar way.They use apps that allow users，after paying a deposit，to unlock the wheels with their smartphones.After the journey，users can leave bikes anywhere in public and pay a little money for the use.The service is very popular as it provides an effective solution to “the last kilometer” problem.
The promoting of the bike－sharing service is also raising questions about profitability，wide－spread bike vandalism (破坏) and theft，and growing government regulation.A Hong Kong man who was arrested for throwing several shared bikes into rivers said he had no regret destroying them because “the GPS devices in the bikes give away users' personal information，such as their locations.”
