I posted this, first time posting here due to what could be a privacy concern to some users.
I have the official My Xbox LIVE app on my iPhone and basically... an example of how to do this would be, a friend is offline for 3 hours, but when you look at their recently played games on My Xbox LIVE, it may say "last played 26 minutes ago" revealing that they were or are actually online, and have not been off for 3 hours. Yeah... I just wanted to point that out because having google'd it, nobody else seems to have mentioned it. And who knows, some stalker could take advantage of this. Just wondering if this was an issue being worked on, as well.