What about a social media site for congressmen where you can only, like / vote / comment if you are a verified constituent and every post is linked to a real identity. And moderation was done wikipedia style. As in a comment may be removed, but you can see why it was removed and it's content and author can still be viewed via history or something similar.
This type of thing is only possible in an environment where there is roughly homogeneous values. When values diverge extremely on basic issues -- only 1 side will trust the tech owners not to shadow ban, astro turf, fake polls etc.
Bold of you to assume the congresscritters are interested in reading the letters written by constituents. At the local and state level I've had _some_ success in getting in touch with my local reps but when it comes to the federal level? Nothing. Every email I've ever sent is responded with the generic "Representative foobar is working for all americans blah blah blah..." followed by the generic press release they send out every few months.
