How to Use Digital Tools to Find Perspective Mates

A great deal of dating and eventually marriage these days in the US and elsewhere happens on dating apps. Digital tools allow anyone to sort very, very, very specifically. So I'm curious what you can tell us about using digital tools to find perspective mates. Are they helping us find needles in haystacks, or are they more helping us find piles of needles that are already neatly sorted? That's a good analogy.