Twitter is two things. It is a concept — everyone in the world connected in real time — that’s so obvious in retrospect that it is impossible to imagine it not existing. It is also a product that has had a rough time living up to that concept.
A good piece by Matthew Panzarino on Twitter's recent launches and struggles to establish a product that makes sense to new users and investors. I'm curious to see where Twitter takes the service in 2015 – Panzarino mentions a redesign, which could be interesting (especially on iOS).