[Q] "Last Seen" on Facebook Messenger
So I hate this feature, but I'm also a bit curious as to how it works. If you scroll to your "messages" bit clicking the top-right icon, you get a list of your friends. Some of them have green dots, which indicates that they either 1. don't use the Android app, or 2. are browsing from a web browser. The remaining ones either have nothing (offline) or they have a number indicating how long ago they were last active.
The number, however, is a bit misleading, but I'm not completely sure how it works. If a user is currently using Facebook on their phone, a "1m" will be displayed. This "1m" remains there, I believe, until 10 minutes after the user closes Facebook--but I'm not completely sure. This also means that, when you see someone is at "2m," that really means they were active 11 minutes ago.
What I'm not 100% sure about is...does this number update when they send a message, or simply browse their newsfeed? Has anybody here run any serious tests to determine what these numbers mean?