The log off time is way screwed up, for example.
I was having a conversation with a friend just this hour, he logs off to go eat and it says he has been offline 12+ hours. Happens with almost everyone on my friends list. It even changes depending when I open it.
for example sometimes it shows someone to be on my first page of friends having been offline for four hours, and sometimes he's on the second page at 15 hours ago.
Don't know if this is just me or not, but it's definitely a bug