I have discovered something! When certain characters are not shown on screen for some time, their popularity goes down!
Take Applejack and Rarity, who's popularity have skyrocketed due to the last episode. Even when Fluttershy was the main character of episode 7, she did not get this much post-episode attention.
This was obviously due to the fact that the other ponies were there as well. In episode 8, there are only Applejack, Rarity, and Twilight, causing an unevenness in discussion.
Our last figure is Spike, who had high popularity after he got screen time in episode 1, 3, and 6. Due to the fact that he has had a total of 30 seconds on screen for 2 episodes, his popularity has dropped immensely, causing even some posters to forget about him.
I feel like those socialists who constantly point out the obvious. Just bored I guess.