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It took over four months for authorship markup to work for our blog. It seems Google are rolling our rich snippet inclusion into the search results very gradually, and their could even be a domain queue based on authority - either way, I doubt the utilisation of the Google+ network will do you any harm at all whilst you're waiting.

Have you looked at the Wikipedia article that is a list of search engines, broken out by categories and countries? http://en.wikipedia.org/wiki/List_of_search_engines