I think Twitter has two big killer features: - Get quick press releases (from the real press, but also from other sources) - Be able to, let's call it politel

I think Twitter has two big killer features: - Get quick press releases (from the real press, but also from other sources) - Be able to, let's call it politely, "interact" with politians and celebrities. If too many celebrities leave feature 2 could be killed, it remains to be seen if increased openness in feature 1 would be enough to compensate.