If you don’t have Facebook (or are trying to chat with someone who doesn’t), no worries! Continue on for the various platform-based tools. If you and the person you want to chat with both have Facebook, it’s really a no brainer. And, since nearly everyone is on Facebook, they probably already have the requisite app, which is available pretty much any platform- Android and iOS have dedicated mobile apps for Messenger, and computer users can just leverage the web version of Messenger.