Representatives don't give a fuck what their constituents have to say on social media. It's full of foreign trolls and bots.

But if you go in person to a town hall / public hearing on an agenda item, they know that you are:

• A real person
• An American
• Extremely likely to vote in the next election.

Source: I successfully killed a local zoning change by convincing my neighbors to go out and speak against it, despite lobbying from a large developer.