Let's list up together here!
We can learn other languages through language feature
We can play simple social games with friends in the timeline
We can post anything and can find, connect easily through mind
We can make music playlist with youtube videos and play it and share
We can ask opinions with vote feature
We can give quizzes for fun
We can set plans and update the process&result with friends's supporting
We can put a memory or plan in to the timecapsule it will opened someday
We can hug someone when they feel sad or something
We can tell secrets without knowing
... and else???