It's called a website. Office holder communicates via his office's offical website. Constituents have email addresses he can email. S/he can setup a slack/zoom/irc channel and have a constituent "town hall".
Tweeting is actually effectively reducing the available bandwidth of communication, and quality of content.
On the other hand, the average person doesn't have the bandwidth to track and follow 50 separate websites for the politicians that affect them....
Like in my case, there's the local village council made of 5 members, theres the town council the village is part of, the county has its own board/council, and then theres the state house and state senate and then theres the US house and US senate, and the finall president.
Tweeting is actually effectively reducing the available bandwidth of communication, and quality of content.