I think your analogy is incorrect. That would be like a shop-owner trying to sue someone who makes a lock-picking set for their model of locks. At the end of t

I think your analogy is incorrect. That would be like a shop-owner trying to sue someone who makes a lock-picking set for their model of locks. At the end of the day, it is the owner of the account running this tool, and FB is saying "don't tell people how to use JS to auto-unfollow people or we'll sue you". It's an extreme measure.