Shares of MercadoLibre (NASDAQ:MELI) hit an another all-time high last week, and there’s another Wall Street pro who thinks the dot-com darling is going even higher.Barclays analyst Deepak Mathivanan initiated coverage of MercadoLibre with an overweight rating after Tuesday’s market close. He’s setting a $250 price target on the stock, translating into 18% of upside from yesterday’s close.