Your search engine is spying on you. In case you missed it you have an alternative in DuckDuckGo which hasn’t been infiltrated by the clowns and there handlers. Their homepage explains a lot…
You may say how do they do it? Because it is the current keywords in any search that drive add revenue at any search engine. Collecting/harvesting your data as Facebook, Google, Yahoo and others do is strictly for surveillance purposes and does NOT help the company be profitable.