The answer to the question “Can my ISP see my Facebook messages?” is a resounding “no.” This is true because all communication from your computer to Facebook is sent through your ISP, which knows your IP address and your physical location. Your ISP also has access to metadata about all your network traffic, including Facebook messages. While it’s technically possible for your ISP to monitor what you’re doing on Facebook, the risk is low.
What do ISPs do with this information? Well, ISPs are required by law to log and analyze your internet traffic. They share this information with spy and law enforcement agencies. These agencies use the data they gather to direct advertisements and marketing to you. This information is collected through a process called Lawful Intercept. In the US, this is called the “last mile.” The final chain of network communications between your computer and ISP is the last mile.
The most common way for hackers to read your Facebook messages is to gain access to your phone. The majority of hackers gain access to your phone through your ISP. A simple solution is to lock your phone, which prevents others from reading your messages. But if you’re worried about this, you should make sure that you use different passwords for your Facebook account. Those who get access to your phone may also be interested in reading your messages.