Nice topic, most informative.
It sucks that Tumbler blocks adult blogs in the robots.txt
This is the robots.txt of
The Official TrueAmateurModels.com Tumblr
Code:
User-agent: *
Disallow: /private
Disallow: /random
Disallow: /day
Crawl-delay: 1
true-amateur-models.tumblr.com
Why is this adult blog indexed by Google anyway?