Presearch is a search engine that you can use to collect your PRE Coins while searching on internet instead of google and it's good thing is that it still your searches redirect to google and show your searching results on google. And if you don't like google you can set any other search engine and it ll redirect your searches to that your favourite engine.
if you want to join it you can get here it's link https://www.presearch.org/signup?rid=288446
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