Twitter is mostly popular for celebrities, they hire social managers to handle their accounts. Twitter is the best platform to express yourself. You can write upto 140 letters in a single tweet and not more than that.
So it is a compact way of expressing your feelings to the world or to the people who are interested in whats happening around you.
Coming to the app, its user interface is not that much user friendly, too much of suggestions which shoukd be reduced.
And we should be able to see only what we want and not the suggestions.