Should we invest in search engines other than Google?

As Google is the most popular search engine in the world for everyone, there is no reason not to spend time on the rest of the search engines, even in some countries search engines like bing, yahoo and others are very popular.

But be aware if you have good entry into the rest of the search engines like Bing, Yahoo, Yandex and … you can use this opportunity to attract customers and increase your site traffic, otherwise investing time and money, on other Search engines are a waste of time and money.