This makes sense from a business standpoint, as 3rd party companies will pay these Paid Search Engine websites to have their webpages listed higher in the website's search results, and in exchange, the search engine websites pay some of the dividends from these profits directly back to their users who propel their business!
Currently, the paid search engine that is known to pay out the most is a website called Swagbucks. By setting Swagucks as my homepage in my web browser, I was able to go about my regular internet business using their search engine instead of Google, and within 2 weeks, I was making an online income on the side which I've used to get myself gaming-related rewards such as Wii points, X-Box Gold Membership, and several other nice periodic benefits.
A simple change in your daily habits can lead to nice rewards down the road.
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Videos:
https://www.youtube.com/watch?v=dA1fFP9blyg