Google Ads are shown as “sponsored links” on Google Search Results Pages.
These Ads appear based on what people are searching for and Google does not require you to log-in, so these Ads tend to be based on what you are looking for.
On the other hand Facebook Ads are targeted at people more specifically.
Why do I get so many Facebook ads for Over 50’s dating sites?
Because Facebook knows I am over 50 and single.
I find this a bit intrusive though.
It is great from a marketing perspective, but surely people don’t like being targeted that directly.
I know I don’t, so I tend to ignore all Facebook ads.