Hey guys! I have a question and hope you won't laugh on it too hard. If I were to create a guide for some Facebook games and sell it, would this be illegal in any way from the point of view of the companies that develop the games such as Zynga or Playfish? The guide is created and written by me but based on their applications. I've seen other guides like this and wanted to be sure if it would be ok with them. Thank you!