It's probably in the top 100 websites with ~1-2 billion page views a month. Having said that I don't think most journalists look past the top 10 when they are look for "major" players in large part because the leaders are simply so dominate. Facebook clocks in at something like 1 trillion page views a month. (Note: that would take 500 million active users * 30 days * 66 page views a day which seems ridiculously excessive, until you consider how addicted some people are to that site.)

(1b) http://www.wired.com/epicenter/2011/02/reddit-billion/ (2b) http://articles.businessinsider.com/2012-01-05/tech/30592220...