Punctuation matters. Barry Welford explains the dos and don't of character marks such as + or % in domain names, and punctuation marks in titles and headers of blog posts and Web pages.
Search engine spiders are particular, but not all see eye-to-eye on punctuation. Welford writes, for example, that Twitter allows both capitalized and lowercase URLs to return the same page,
whereas Google considers the same pages, http://twitter.com/google and http://twitter.com/Google, as different. He provides other examples, too.
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