You still can, you just have to be strategic about it due to a higher noise to signal ratio. I've helped a few of my friends and fellow HN'ers with it.
Each individual case differs, but it is always a variation of looking as your best self (or best photogenic self for online dating) and putting yourself out there a lot. You're looking for someone that you click really well with. So ultimately, it's a needle in a haystack thing.