Update: Facebook Tests Locking the Top Navigation Bar in Place as Users Scroll

Many Facebook users are seeing the site’s top navigation bar locked to the top of the browser window no matter where they scroll. This floating navigation bar gives users access to their notifications, friend requests, messages, and links to the home page, profile, and account settings at all times. Previously, if users scrolled down the news feed, a profile, or other page on the site the top navigation bar would scroll with it and become hidden from view.