Finding out if someone is using dating sites
In order to find someone on the Web, you're going to need all your sleuthing skills - very rarely does all the information you're looking for come to you in one search. The behemoth search engine tracks everything users search for and provide; some people call it spying while others call it smart business.Type in who you're looking for into Zoom Info and you'll potentially come back with a lot of information that leads to other information: i.e., links that show you where else that person is on the Web (that's IF they have a presence online.If the person you are looking for doesn't get on the Web much, this isn't going to do you much good.).Regardless, the information can help you immensely if you know where to look.
You can use this article on Google People Search for specific Google tips that will help you find who you're looking for with this popular search engine.
I never suggest that readers utilize these sites; they are accessing exactly the same information as you are and therefore you should not pay to find people online.