For the first time ever, Twitter has now passed Digg in U.S.-based traffic.

Twitter climbed to the #84 spot in market share last week while Digg landed at #85, according to new data just released by Hitwise. The data analysis company credits the heavy Twitter traffic related to the U.S. Airways crash into the Hudson River for helping bring the site over the edge. Twitter’s success is likely even larger than it appears here, too, as these figures do not take into account Twitter...