Wikipedia's content is licensed under the GNU Free Documentation License, which allows our content to be copied and used for virtually any purpose, so long as the author is credited (and a few other small conditions). Wikipedia's database is freely downloadable. The reason we do this is to make our content reusable to third parties.

Every bit of Wikipedia related meta-data that is used in articles is one more thing that a re-user has to take out when they copy our database. To this end, it is very important that Wikipedia-related designations, so called "meta-data", be kept out of articles.

Common examples of meta-data:

Talk pages were created in order to avoid having discussions of article content in the article itself. Talk pages are an appropriate place for Wikipedia-related metadata. The article itself is not.