. >> you can have a conversation with salmon rushdie and tag at king to margaret atwood and be conversing on twitter. >> rose: he leaves the table, i don't know whether he did this or not, people leave the table, as soon as they leave the table, cbs this morning and here they are tweeting about the experience. i was with charlie rose and i said this or he asked me this, asked me this qtion is all all a reflection of what just happened to them. >> yes. >> rose: raises this question, 140 characters are here to stay photography? >> it is sacrostangt, yes. >> rose: why is it sacrosanct? >> because it works. >> rose: that's a good reason. there is something about the constraint that is -- makes it exactly the right length, and i don't know what it is, and i don't pretend to know what it is but you will have conversations with people like professional comedians and they will tell you and i wrote this joke and used twitter sometimes to test out new jokes and when i was done with it, it was 150 characters and i thought, darn it if only twitter allowed me to use 150 characters and i went and edite