Great post, very insightful. I had not really noticed serivces like FB and Twitter had moved the logout button the way they have until you pointed this out. It

Great post, very insightful. I had not really noticed serivces like FB and Twitter had moved the logout button the way they have until you pointed this out. It is quite a clever idea, as your post suggests sites that offer a service or product require the user to be logged in to get a personalised experience. Users are less likely to logout if they cannot see it as an option.