us stock benchmarks opened modestly higher tuesday morning as wall street attempted to bounce back after the previous days slump led by technology companies the dow jones industrial average djia rose 164 points or 05 to around 34148 the sp 500 index spx added 21 points or 05 at 4321 while the technologyladen nasdaq composite index comp advanced 86 points or 06 to 14340 meanwhile shares of facebook inc fb were up 04 a day after the socialmedia company slumped by nearly 5 a whistleblower is set to testify about facebooks socialmedia practices later in the morning which could weigh on the companys stock