The Pew Internet and American Life project recently published a report regarding how Americans get their news online. According to the report, "Some 50 million Americans turn to the internet for news on a typical day, a new highwater mark for online news-gathering."
Moreover, "9% of all internet users have been to news blogs, with 12% of broadband users saying they've been to news blogs." A different Pew study shows that 73 percent of adults, or 147 million people, now use the Internet. So that's over thirteen million Americans reading news blogs, with countless more using news blogs around the world.