The Premise of OPSEC
The premise of OPSEC is that the accumulation of one or more elements of sensitive/unclassified information or data could damage national security by revealing classified information.
The Goal of OPSEC
The goal of OPSEC, as a "countermeasures" program, is to deny an adversary pieces of the intelligence puzzle.
The Intelligence Puzzle
Intelligence collection and analysis is very much like assembling a picture puzzle. Intelligence collectors are fully aware of the importance of obtaining small bits of information (or "pieces" of a puzzle) from many sources and assembling them to form the overall picture.
Intelligence collectors use numerous methods and sources to develop pieces of the intelligence puzzle . . .their collection methods range from sophisticated surveillance using highly technical electronic methods to simple visual observation of activities (these activities are referred to as "indicators").
Information may be collected by monitoring radio and telephone conversations, analyzing telephone directories, financial or purchasing documents, position or "job" announcements, travel documents, blueprints or drawings, distribution lists, shipping and receiving documents, even personal information or items found in the unclassified trash.
In the case of a website, information is easily collected by downloading the content and analyzing it for information. Lets do our part to keep America safe by not posting anything which may be of use to our adversaries.