July 2007
Underscores are now word separators, proclaims Google | Tech news blog - CNET News.com
by nhoizeyunderscores in URLs are now (or at least very soon to be) treated as word separators by Google
November 2005
Tiret ou underscore ? Enfin la réponse ! - WebRankInfo
by pyxosledisciple (via)Bien écrire ses urls pour optimiser son référencement...
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(2 marks)