Stocks continued to hold in negative territory in early-afternoon action today, but had lifted off their session lows. The Dow Jones industrial average and Nasdaq both lost 0.7%, while the S&P 500 fell 0.6%. Volume has turned mixed in the stock market today, tracking up a little from Wednesday's level for the NYSE, but down slightly for the Nasdaq. On the earnings front, LinkedIn (LNKD) dipped 1% in strong volume ahead of its fourth-quarter report