If your goal is to find out how people on reddit actually talk about it (rather than what kind of…

If your goal is to find out how people on reddit actually talk about it (rather than what kind of discussion from *other people* on the subject redditors value), a cutoff at the 100 karma threshhold is probably going to produce horribly skewed results: because karma determines presentation order, it grows non-linearly, which means that only a few very popular comments will get more than single-digit karma. If you want to get a smaller data set but keep it representative, I would isolate comments with exactly one karma point.