The Mirror Online has become the second most popular multiplatform news Web site, overtaking the Guardian for the first time, new comScore data shows. Mirror.co.uk recorded 22.1m unique monthly visitors for November -- up 2% year-on-year -- putting it ahead of ahead of theguardian.com with 21.6m uniques, down 10% year-on-year. Mail Online continues to be the most visited site.