Does FB Ads use Google Search?

Hi, FB Advertisers.

I do not know if it is myth or not. And this is probably a ‘Newbie question’.

If I search for a mechanical keyboard on G, I suddenly start seeing mechanical keyboard ads on both Facebook and Instagram.

How are they connected? Or are they connected?

If they are somehow connected, can a good On-Page SEO and keyphrase density decrease my Cost per Conversion ?

Well, hope you guys enlighten me..

I guess this one needs to be answered ..?

Google works as search engine you know, whenever the searching keywords matches with keywords of your content it shows it. Maybe it shows on page number 10/12/22/50 as there are many match with the KW. To bring your KW on Google first page you have to work on it.

Just after searching on Google, you will not see ads.

You search and visit websites from Google and then you will see ads. It is basic retargetting ads.