Block refinement. At the moment valid, informed discussion on the platform is hampered by the ability of users to block people who disagree with their views. Users should absolutely be able to block other users who are abusive/bullying etc, but not if they are sincerely communicating a difference of opinion, especially if that opinion is backed up with data/information. Twitter's main goal is to "serve the public conversation" and it is failing to this. Twitter at the moment makes it too easy for extremists and conspiracy-theorists to exist in an echo-chamber, only hearing what they want to hear. For a truly democratic system, this should not be possible; one’s views should always be open for debate and critique. Two proposed solutions: a) The introduction of certified users who cannot be blocked by another user (unless they have been judged by Twitter to be abusive/bullying – they then lose this privilege). This could be automatically activated after a time period (say 2 years) which would stop bot accounts having the privilege. b) The ability of a user to complain when they are blocked unfairly by another user. Twitter could then judge if this is a fair case and override the block. I personally think option a) would be more democratic and less labour intensive that b).