The Facebook messaging application is completely free. This means that we do not have to pay to install it. We also do not have to pay anything if we want to use its service. Sending and receiving messages, and making calls and video calls can, therefore, be used freely at no extra cost. The only requirement is to have a Facebook account that, of course, is also free.
But we must not be naive. Facebook Messenger is a business and brings benefits to its parent company. Thanks to its applications, the social network of Mark Zuckerberg monitors and processes our personal data and behavior. This translates into personalized advertising that fits our likes and interests. We agree to have our information used in this way when we register and accept the terms and conditions.
On the other hand, Facebook Messenger includes advertising within its application. Unlike Telegram or WhatsApp, sponsored conversations from different services and companies will appear in our chat list. If we tap on them, we will access product catalogs that we can buy, or they will recommend us to download other applications. Thanks to these ads, Facebook gets paid, and thus, makes Messenger profitable. These kinds of ads are so well integrated that we probably do not notice them with the naked eye.
In summary, if we talk about money, Facebook Messenger is a free application. However, it is important not to forget that we are paying for the service with our personal data and with the advertising shown to us based on it.