Reddit had 731m unique visitors and 56bn page views in 2013

"2013 Overall reddit Stats (approximate)
56 billion page views
731 million Unique Visitors
An Average Visit Duration of 15 min 55 sec
40,855,032 posts
404,603,286 comments
3,676,091,578 comment votes
3,037,413,635 link votes
6.7 billion total votes

Top Ten Countries by Unique Visitors (monthly)
1. United States 48,533,932
2. Canada 7,415,650
3. United Kingdom 6,164,527
4. Australia 2,847,846
5. Germany 2,143,252
6. Japan 1,015,365
7. Sweden 988,575
8. Netherlands 940,352
9. France 892,128
10. Brazil 811,757"

Source:  Reddit blog, 31st December 2013
(Lots more stats listed in the blog post)