More bot trickery: favourite on keyword and followback

[zhuowei]

https://twitter.com/Helenderson/status/523883553936113666

Basically, people would follow a bot, then immediately unfollow it so that the bot would favourite their tweets based on the hardcoded keywords.

To counter this, I disabled the hardcoded keywords and added a task that cleans out the followers once every hour. https://github.com/zhuowei/is_like_a

If you want to keep the hardcoded faves, maybe listen to unfollow events from the stream and unfollow back to avoid this?