How a third party can remove your pages and site from Google’s Index?

Be aware of all .info sites.

With the introduction of “Big Daddy,” Google crawls from many different data centers; they also changed the algorithm substantially at the same time. According to Dan “It appears that the changes include moving some of the duplicate content detection down to the crawlers. [This is problematic. In short:]

1. The original page exists in at least some of the data centers.
2. A copy (proxy) gets indexed in one data center, and that gets sync’d across to the others.
3. A spider visits the original, checks to see if the content is duplicate, and erroneously decides that it is.
4. The original is dropped or penalized.
”
So … the problem is that if you flood Google with massive amounts of duplicate content, it exposes a vulnerability. Eventually the algorithm makes a mistake, and your content is no longer authoritative.