Take a moment to consider how many passwords you have online. Sure, there are the primary three or four that you use every day, but how many sites have you created accounts on? Online shopping, accounts associated with work, apps required for package delivery, and more are all things that require passwords.
All of those areas
Yes, your Facebook account or Facebook Messenger can get hacked or get a virus, unfortunately. Facebook is generally pretty good at filtering these out. (This is why it’s also important to keep your Facebook and Messenger apps up to date.) However, they are still out there from time to time. New ones are being created all the time, too.