I’m sure it certainly doesn’t help to have all these follower alerters polling their API constantly. I personally feel that knowing when someone follows you is rather useless, but since it’s what the majority of users want ¯\(ツ)/¯.
Also, http://tmi.twitch.tv/group/user/esltv_lol/chatters and other eventchats currently give 502s in a reproducable manner. I think this is a know bug (that has persisted for at least 2 months now), but it might be connected… idk.