GREECE AGAIN: All it took to derail a day of stock market gains was a headline saying that Greece was preparing to leave the euro. A 50-point gain in the Dow Jones industrial average quickly evaporated. A last-minute recovery left the Dow down just 1.67 points at 12,502.81.

HOUSING HOPE: Stocks spent most of the day higher after the National Association of Realtors reported that sales of previously occupied homes rose 3.4 percent last month

FRIENDS?: Facebook kept sliding, dropping 9 percent to $31. The social networking company has fizzled since its long-awaited initial public offering last week at $38.