Facebook: Only 5000 potential friends. You need to create your own page and build from the bottom to do anything. Your content gets quickly buried and forgotten.
Twitter: Make a post saying something like “politicians need to follow through on promises.” after years of working in and studying politics. They tell you to take a civics class.
Reddit: Make a post which is well thought out, has to do with a particular topic on a subreddit, and share it. It gains traction quickly. As soon as it really starts taking off a mod removes your content. It’s over.
Basically, if you find a creator you like, you need to subscribe via RSS.