Clinton's sharing-economy remarks draw reaction in Silicon Valley

By Sarah McBride SAN FRANCISCO (Reuters) - Presidential contender Hillary Clinton's comments on Monday on the sharing economy struck a nerve in Silicon Valley, home of such companies as Uber, Instacart and Airbnb.    "This 'on demand,' or so-called 'gig economy,' is creating exciting opportunities and unleashing innovation but it's also raising hard questions about workplace protections and what a good job will look like in the future," Clinton said in h