There&#x27;s a pretty big difference between communicating in and about the present vs. communicating about the past. I think what you&#x27;ve identified is the beginning of a distinction between those two activities in the technologies we use.<p>My grandparents have a large collection of photos, each captioned with the year, location, and the reason the photo was taken. Looking through these photos is a great experience because it&#x27;s a curated history of their lives. For better or worse, the practice maintaining photo collections in that manner has been made obsolete by technology. The equivalent now is to upload everything and have technology curate it for you, filtering out the mundane and saving the important or otherwise memorable content. That&#x27;s what the Facebook timeline attempts to do, and it&#x27;s a feature missing from the other social applications you identified.<p>I don&#x27;t think it&#x27;s a failure of Twitter or Snapchat that they lack curated timelines, though. That&#x27;s not their purpose. They are aimed squarely at communicating at and about the present. If they do take over in-the-present communication from Facebook, though, then Facebook will have a hard time constructed the curated timeline.<p>All that being said, I don&#x27;t use any of them.