Maybe let existing users continue like today and charge only for new users?<p>Personally I think twitters problem is much simpler: it is just a media&#x2F;subset of biz&#x2F;subset of tech thing.<p>The only thing twitter has over other services is brand recognition and a certain community.<p>On all other areas they are owned by both Facebook and even Google+<p>I remember being exited about twitter years ago: I saw lots of possibilities like &quot;event streams&quot; for automated processing,  I thought they&#x27;d come up with a way to mark certain messages as mostly relevant for certain groups of followers etc.<p>What they did instead was focusing on painting themselves into the 140 revolutionary characters corner and keeping the paint wet from time to time by messing with the API etc.