Nationwide, readership on newspaper web sites increased 9 percent over the previous year, according to the latest figures from Nielsen, and the big winners in terms of “unique audience” were the NY Post (up 62 percent), NY Times (up 21 percent), LA Times (up 20 percent). Among the big losers was the Chronicle’s sfgate, the nation’s No. 5 newspaper Web site, whose “unique audience” fell 2 percent. The Huffington Post’s Blake Fleetwood analyzes the figures. The news isn’t good for the Chron, which has seen steep circulation losses for its print edition as well.