I've had some success with looking at meetup.com and finding when some kind of group is going to meet up somewhere, show up, and see if things click. I played some board games recently and then got added to the weekly text notification and now have some adults to chill with when I have an opening on that day.

Facebook is used for a lot of notification/scheduling at my local game store though. I refuse to use Facebook, but don't want to be a burden on everyone else. I found some people I like and gave them my phone number and told them I'm down for a game whenever they are. Although rare, I have gotten a text before and gone and had fun.