Any different "word-word" and "word_word"?

what different between "word-word" and "word_word" and "word.word" and "wordword" ? I can see seochat use "word-word" for URL I know domains...

Źródło: http://www.vbulletinsetup.com/168-search-engine-optimization/76019-any-different-word-word-word_word.html

czw, 11 sierpień 2011

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