If you mean that they remove all anarchy in a newly conquered city, then no. Each Story Teller reduces the anarchy by 1 turn and give some of your culture to the conquered city. Entertainers and Celebrities are more powerful. All have a small chance of surviving the experience and being sent home. Yes, you can use lots in one go and you should send some with your troops. Yes they can be used in your own cities for extending culture. However they have been around for a long time and are basically balanced. We just don't know why they don't work. Probably next on my to do list.