The first question you need to ask yourself is why can’t I see when someone was last active on the social networking site? This can be caused by several internal issues, such as a change in server settings. You can fix the problem by logging out of Facebook and logging back in. There’s a workaround, however: turn on Messenger’s “Active Status.”
The answer to this question lies in Facebook’s own guidelines. First of all, it’s important to understand that the “last active” status is determined by the time of a user’s last chat on the social network. Obviously, a person who constantly posts on Facebook will disable their last activity status, but if someone’s message is sent to the wrong person, they will show as “Online” until they confirm that they’ve turned off the status.
Another way to determine a person’s last activity on Facebook is to check the “last seen” status next to their username. This will indicate when that person last logged in to Facebook Messenger. When someone has “Last Active” enabled, they’ll have a green dot next to their username. However, this feature is not available for everyone. To make it available for everyone, you’ll need to add the user to your friend’s Facebook account.
The “last seen” status is often hidden from view. The person may be blocked on the social networking site or has turned off the Messenger status. However, you can still see the last seen status of friends and contacts. You can also check a person’s last activity by checking their recent activity. The last seen status is the best way to tell if someone is online or not. There are several ways to view a person’s last active status.