Also categorized in Web Search:
The Filter Bubble: Algorithm vs. Curator & the Value of Serendipity (Video)
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Google Search, Punctuation Marks and Other Symbols
Google usually ignores punctuation and mathematical symbols from a query because it doesn't index them. They rarely change the meaning of a query and Google's index would have to grow a lot bigger, without improving the results too much. Some punctuation marks and mathematical symbols are used to provide advanced features (for example: colon, quotes, minus sign, plus sign).