What is the Breidbart Index (BI)?
The Breidbart Index (BI) is a measure of the breadth of any multi-posting, cross-posting, or combination of the two. BI is defined as the sum of the square roots of how many newsgroups each article was posted to. If that number approaches 20, then the posts will probably be cancelled by somebody. For instance, four identical posts to nine newsgroups each (4 times 3) has a BI of 12. However, nine identical posts to four newsgroups each (9 times 2) has a BI of 18.