SEOmoz has indexed over 30 billion pages of the world wide web, and released a tool based on that index called Linkscape. They have learned some interesting statistics from this index such as:

- Across the web, 58% of all links are to internal pages on the same domain, 42% point to pages off the linking site.

- 1.83% of all links on the web are nofollowed and of these, 61% are external-pointing, while 39% link to pages on their own site. While those percentages may seem small, that’s a massive number (~2 billion links) that are leveraging nofollow for link juice “sculpting.”

- While 0.08% of pages on the web use the 301 redirect, 0.12% (nearly twice as many) employ 302 redirects. Another 0.005% use the meta refresh.

- About 1.5% of all pages use the meta noindex tag (which is a lot of content the engines don’t get to see) and 0.87% of all pages use the meta nofollow tag.

- From our entire index of pages, the median page received about 77 links (both internal and external), while the average page gets 32. If your pages have more than 32 links, congratulations! You’re above average :-)

Learn more about all of SEOmoz’s big news here.