Twitter is a very simplistic core. Around that core is a whole ecosystem that adds value to Twitter. You have a large choice of “-Twitter clients”-, and there are plenty of websites out there that complement the basic Twitter service.
It is the anti-BetFair case. The future prediction exchanges will be built around a simplistic core, and there will be plenty of add-ons and complimentary services —-all of which will be optional, so as not to scare off the newbies.