In general, I look for possible friends. With the JWs when I was in growing up, because of the power of my family, I knew SO many people and we were always having company and going out. I didn't have any "true" friends (besides Gojira, obviously) and have found that out over the years. I long for companionship (marriage doesn't count, especially since we are pretty much just staying quietly civil for the kids), so anything that seems to offer conversation, friendship, and different interactions will hook me. (JWN here, as an example.) As soon as things start to seem a little "off" to me, I fade out or just leave (certain online mom forums that are nothing buy childish drama whores).
I think it's the friendship and seeing true joy with groups and people. The local farmers markets are another example. We used to be pretty active in purchases for a few local businesses, and it was a pleasure because you could just see the way they enjoyed what they did. I guess it's just a gut feeling instinct for me. It's not always right (remember, I was Mormon for a bit), but gives me lessons and experiences that I need at that time.
Not sure if that's the answer you're looking for, but that's how I took the question.