Breidbart Index (BI)

The Breidbart Index (BI) is a weighted measure of posting and cross posting of an article in newsgroups in which an index of 20 or greater is taken by some administrators to be a spamming violation and the posts liable to cancellation.

The Breidbart Index is defined as the sum of the square roots of n (n is the number of newsgroups each copy was posted to).

Example: If two copies of a posting are made, one to 9 groups, and one to 16, the Breidbart Index is 1*sqrt(9)+1*sqrt(16) = 3+4 = 7

Example: 10 copies of an article are posted, each cross-posted to 4 groups, the BI is 10*sqrt(4) = 20

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