Stocks posted slight gains, with the Dow delivering its ninth consecutive day of gains on solid economic data. Retail sales were up 1.1% last month, the largest gain in five months and better than forecast. Business inventories rose 1% in January. On the corporate front, Netflix rallied 5.6% after the co. started new social features with Facebook . Walgreen gained 4.2% after UBS hiked its rating on the drugstore chain to buy from neutral. BlackBerry soared 8.2% on announcement that an unnamed partner has placed an order for 1 million BlackBerry 10 smartphones. Also, Verizon Wireless announced that it plans to begin selling the new BlackBerry Z10 smartphone in the U.S. on March 28, about a week after AT&T. Texas Instruments fell 0.9% after Bernstein Research downgraded the co. to a neutral rating, citing the need to “move to the sidelines on cyclically-exposed names” based on signs of higher inventories and “modest” expectations.