What does the minutes next to the iPhone signal mean on te Facebook chat app?

When I'm on Facebook chat app the people who are on mobile have minutes next to their names as well as the iPod/ iPhone picture. It's misleading as you don't know if someone's currently on face book chat, does it mean how long ago they were active? So if this guy was constantly on 1 minute, does that mean he's online on his phone?

It means they were active that many minutes ago.

  • When creating a message on an iPhone, what does the blue chat bubble thing mean? Whenever I'm sending a message, like creating one, and I type in a person, sometimes a blue chat bubble will come up. What does that mean?
  • What does this mean on iphone chat? This will sound like a dumb question, but For my iphone chat, my messages are in grey, and the person i text is in green. My last text, showed up as a "blue cloud" for a message as opposed to grey. What does this mean? Did my friend get my text (he hasn't responded, granted it could be just him).
  • On the new update iPhone Facebook app what does the last active mean? Okay so I updated the Facebook app for the iPhone 5 and when I look at my Facebook friends it will say last active 1m, 2hr, or active now. I'm just wondering does this mean the last time they are active on Facebook like logging on and just looking at the news feed or is it last active on the messenger messaging people?
  • My iPhone 6 (iOS 9) is showing the wrong amount of minutes next to updates on my lock screen? For example, if I got a text 9 minutes ago, instead of saying "9 min" next to the text (on my lockscreen), it will say "3 min" instead. I don't know why it's started doing this. I think it's probably a small problem with iOS 9 or I accidentally messed something up when I created a new iCloud account last week, which is around when this started. Does anybody know how to fix this?