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Will URLs like this site.com/!#users only be crawled by Google's search engine bots, or is this a standard adopted by all search engines (e.g., Yahoo, Bing, DuckDuckGo, etc...)?

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using history.js you can avoid appending # to the url while dynamically changing url – Jobin Jose Nov 24 '13 at 6:45
@JobinJose that actually needs html5 API as i can see, but anyway thank you for the advice ;) it's a really good product – HugeNut Nov 24 '13 at 10:44

Bing, which powers Yahoo, does support Google's standard. There is no indication that Duck Duck Go does.

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DuckDuckGo does appear to support this in addition to Bing.

The site imelda-immobilien.de has no "static" pages, they're all ajax driven. A search on Bing and DuckDuckGo shows multiple ajax urls in the results. Yahoo is powered by bing, and a yahoo search shows the same results.

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