Rising and falling subreddits according to virality trends

For the past week, I've been mapping out virality trends on various subreddits to better understand how posts go viral on reddit. As a neat side effect, I discovered a method to detect rising and falling subreddits. Basically, a "rising" subreddit is one that has a large, steady increase in hotness over time (blue to red), whereas a "falling" subreddit is going in the opposite direction (red to blue).

Rising subreddits

Here's the rising subreddits I've manage to detect: /r/4chan, /r/AlienBlue, /r/AskWomen, /r/battlestations, /r/Demotivational, /r/Diablo, /r/dubstep, /r/Fallout, /r/IWantToLearn, /r/JusticePorn, /r/learnprogramming, /r/MorbidReality, /r/Steam, /r/TrueReddit, /r/woahdude

Falling subreddits

Here's the falling subreddits I've managed to detect: /r/itookapicture, /r/MURICA, /r/Frugal, /r/Health, /r/Homebrewing, /r/keto, /r/loseit, /r/progresspics, /r/sex, /r/travel