By Sarah McBride SAN FRANCISCO (Reuters) - In a big bet on marketplaces, venture capital firm Greylock Partners is promoting former eBay Motors founder Simon Rothman to partner, and dedicating $100 million to the sector. Marketplaces - companies like auction service eBay, accommodation service Airbnb, and personal-loan service LendingClub - have the potential to create more billion-dollar businesses in the next five years than in the last 20, Rothman said in an interview with Reuters. ...{br}{br}View the Entire Article{br}