DuckDuckGo

Bangs are shortcuts that quickly take you to search results on other sites. For example, when you know you want to search on another site like Wikipedia or Amazon, our bangs get you there fastest. A search for !w filter bubble will take you directly to Wikipedia. Remember, though, because your search is actually taking place on that other site, you are subject to that site’s policies, including it

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Twitter検索への直リンク便利だな