This idea starts with this simple premise:
Today should be better from yesterday
In social-network-ify sense of solution, I think it’d be nice to have a twitter-like app which answer this very question and let users to answer this very question:
What have you learned today?
I know, this still can be achieved by using existing popular social networks and utilizing their hashtag feature. However, if there’s an app which focuses on this matter and it is backed up with community of people who love learning new thing, I think standalone app can be better than existing solution.
I think an offline-only app with this kind of aim is a good idea too. Not every single thing in life should be shared, I think.