TBH you can use anything, as I believe near anything can be turned into a joke with a bit of thinking/research. Just look at game mechanics, or potentially better yet get out a game and play a bit - tends to work for me when I want to make fun out of something.
But if you're writing stories, I'd suggest looking beyond just throwing in internet references as that can be just forced comedy, or jokes everyone knows already if they've been on the internet for a bit - such stories tend to fall flat, simply. (Furthermore, what sort of jokes would you make anyway?) The story would be more interesting if you structure it around an actual plot or something so there's a story to follow rather than just jokes around a topic... Of course if you do that already then so much the better, hard to tell what sort of story you're really doing from the info you've provided so far. =P
