Digital Trends: How to use Mastodon: create your account, join servers, and more. “The best part about Mastodon is that you can follow users in other Mastodon instances, even if you are not a member of that instance. Think of it as being able to talk with a person in a Facebook Group or a WhatsApp group chat without having to join that group. The rest is a familiar affair. You can write posts worth up to 500 characters in length, share photos and videos, repost someone’s else content, and more.”