Thinking about my friend group, about half the people met their long term partners on dating apps. The other half is a mix of work and large social groups (eg: people who all go to certain kinds of music festivals)

I guess it varies by age and region.

pewresearch.org/…/key-takeaways-on-americans-view…

While meeting partners through personal networks is still the most common kind of introduction, about one-in-ten partnered adults (12%) say they met their partner online. About a third (32%) of adults who are married, living with a partner or are in a committed relationship say friends and family helped them find their match. Smaller shares say they met through work (18%), through school (17%), online (12%), at a bar or restaurant (8%), at a place of worship (5%) or somewhere else (8%).

Some other sources I’m seeing say it’s as high as 60% of couples met online.