There are 2 methods of asking others, in real life, if they're Redditors:
1: Act completely serious and somewhat inquisitive, as if you're about to impart basic yet valuable information. "Do you go on Reddit?"
2: Weigh weather or not asking will make you seem like a complete nerd, decide it's worth it, and ask, "Do you go on Reddit?"
There are 3 responses, and 3 reactions.
Response 1: "Yes! I love Reddit! OMG today did you see the picture of the parrotlet hiding in the hoodie? So funny!"
Reaction 1: You both now share something special that you didn't know you shared.
Response 2: "Um, well, I know what it is but I don't go there."
Reaction 2: They think you're kind of weird (if they didn't already) and you now have to either explain why Reddit is awesome (which never really works) or drop the subject entirely.
Response 3: "What's that?"
Reaction 3: You now have to either explain what Reddit is (which isn't easy) and why it is awesome (which, again, never really works) and then explain why it ties into what you were talking about, or drop the subject entirely.
You always hope for Response/Reaction 1.
Not long ago I was hanging out with my lady and our friend used Method 1 to broach the Reddit subject. I gave Response/Reaction 1 and my lady was somewhere between Response/Reaction 1 and 2. She wasn't a Redditor but knew lots about it since I talked about it all the time. Now she's a Redditor too! (To be fair, all three of us are more lurkers.)
Tonight I broached the Reddit subject using Method 2. I was slightly nervous I would get Response/Reaction 3, and then be a total nerd (and not the cool kind) as I tried miserably to explain the very weird amalgamation of news and cartoons and science and pictures and inside jokes that is Reddit. Luckily, I got somewhere between 1 and 2: he is a Redditor but seemed thrown off by my asking.
When I learn someone is a Redditor I like them that much more. When my friend asked if we were Redditors I nearly jumped in the air with excitement. Someone automatically gets approval points for mentioning Reddit, and someone I don't know well I'll want to know better. I feel like there are others out there, everywhere, who do what I do, like the world is much smaller than it seems.