This is the core strength of the platform – it's easy to send a message to a Facebook friend, companies use it to contact customers, group pages can have associated group discussions, and it's useful for selling products on Facebook Marketplace, among other things. If you have a Facebook account, you have a Messenger account. Works with: Phones and tablets (Android, iPhone, iPad) use an app, and for computers you can either click the Messenger icon in the top right of your web browser's Facebook page to use chat windows, or visit the Messenger web page directly for a larger view with more options.