'a few GOP consultants are building a parallel digital universe where their political clients set the rules. The apps deliver curated partisan news feeds on private social media platforms, free from the strictures and content guidelines imposed by Silicon Valley giants. Some allow supporters to comment on posts or contribute their own, with less risk that their posts will be flagged as offensive or abusive. Imagine a society in which everyone more or less agrees with you. Sheltered from the broader public, the platforms can intensify political polarization and social divisiveness, or circulate disinformation -- online news feeds & greetings from people who share your views on guns, religion and country-- like-minded politicians or articles from like-minded news outlets. You can safely post your own comments without fear of vitriol from trolls or challenges from naysayers.'