The reason they hid the logout option into the dropdown menu in the last overhaul of facebook - after advertising was introduced - was to stop people doing it so often.
This way you are still logged in and racking up time spent on facebook. This "time spent" is what facebook pitch to advertisers when they say how many people are actively online looking at their adverts when in fact most the users are nowhere near the facebook page and have shut the tab. It's pure marketing genius and the advertisers fall for it hook line and sinker. Its simply a way of twisting the stats of how many users are online at once and how long they spend there as well as gathering their surfing habits to direct more specified adverts towards them.
This way you are still logged in and racking up time spent on facebook. This "time spent" is what facebook pitch to advertisers when they say how many people are actively online looking at their adverts when in fact most the users are nowhere near the facebook page and have shut the tab. It's pure marketing genius and the advertisers fall for it hook line and sinker. Its simply a way of twisting the stats of how many users are online at once and how long they spend there as well as gathering their surfing habits to direct more specified adverts towards them.
