The design of a new twitter doesnt start with the how question. You can write it in php or even python for all i (or the market) care. The question is what a new twitter should be used for. Politics and social issues will always be loud and argumentative, so we probably dont need that as thats what twitter already does. A nice community for people to follow other people for various crafts and topics would indeed be nice. Maybe a place where we can follow popular scientists, technical organisations, artists, actors, and generally speaking anyone non political. Something as basic as twitter in terms of ui but without the garbage twitter has.
