When I am online it shows my contacts online with a green dot. Some show a phone icon, which I assume means they are on facebook mobile. The all have a number and letter, such as 2h, or 11m. I am assuming this means hours and minutes, but what do they mean? Have they been offline for that long or online for that long. What do these mean?
The hours and minutes represent how long it has been since that person was last online.