"When Facebook started in 2004, it consisted of only your profile page, no “wall” or “timeline” as we know it today for interacting with information, updates, photos, links and more. Facebook has made many large-scale changes since it’s inception in 2004, and now, it has evolved to recognize where each user has left off on his or her timeline, ensuring that no update goes unseen. The news feed is personalized and relevant to you - it only shows you posts from your friends, or paid ads that are highly relevant to you based on your profile or organic articles of pages you've personally liked. Plus, it gives you a bi-directional conversation in that you control what you do or don't like seeing and how you see it. The social networking site also recently released a feature that allows users to “save” for later by flagging images, links, music and other items and revisit them at another time. "
Then and Now: How These Top 5 Websites Have Become More Like Apps