Automated identification of gaps in knowledge

It would be useful to have a web crawler that analyses word, phrase, acronym and initialism usage on the web, compares it to Wikipedia and Wiktionary, and identifies where articles (for either Wikipedia or Wiktionary) are needed.

Likewise corporations could use such technology to analyse the word, phrase, acronym and initialism usage on their intranet (and possibly internal email and internal filesystem, etc), compare it to Wikipedia, Wiktionary and to internal Wiki/Glossary pages, and identifying where articles are needed.