What you choose to repeat or amplify is an aspect of speech. In other words, the first amendment protects both people's ability to say (or not say) whatever the

What you choose to repeat or amplify is an aspect of speech. In other words, the first amendment protects both people's ability to say (or not say) whatever they like without governmental restriction, as well as others' ability to host (or not host) whatever speech they'd like without governmental restriction. In addition, this falls under freedom of association; people (individually and in groups) are free to choose who they associate with, and include or exclude anyone they like based on any criteria they like (with certain specific exceptions regarding protected classes). "We reserve the right to refuse service to anyone" - for instance, a restaurant or store (or an individual at home) can kick out someone being disruptive, and so can a web host or social media platform.