I was quite early on Reddit and watched Imgur grow literally from the announcement thread. It got bigger and bigger and I often used it myself.

But I remember one day being at a friend's house and she was asking me about something I'd sent her, "oh did you see that in Imgur she asked?"

"What do you mean did I see it on Imgur? I saw it in Reddit, it's just hoisted on Imgur."

And she was like, "What's Reddit? I love Imgur, I scroll on there every night."

I couldn't believe it, I went and checked and there was indeed a whole community, leaving contents and voting on things and doing all the rest, and many of them never heard of Reddit

You're right, it does feel strange, there's somehow something very uncanny about it.