Facebook and dating sites
You can join a “group” about hiking in your area, for example, and connect with other people are interested in similar activities as you.
Or, you can check out friends of friends and ask for an introduction to someone who catches your eye.
Most of the other dating sites/apps are owned by 1 or 2 companies.
Hmmm, Facebook's new Graph Search is not mentioned here.
I see that it still is in Beta so it is not available to most Facebook users.
We may receive advertising compensation from the sites listed on this page if you click a link and buy a product or service. While the group discussions are probably the best way, it may be better to message your current friends on your list that you trust to see if anyone is single.
Another option would be to post from time to time a one word response on your timeline that says "I am single" and maybe update that every few months with the same status.