I have just returned back to my old workplace where they saw me go through quite a bit with my parents. I don't have any immediate work colleagues on FB, but I have babysat for a few of them, and when I was going through crap, there was always someone to listen. When stuff was going on with them, I would be a friendly ear too.
I am on leave this week, the guys in the office know I'm staying at home, and I don't expect to hear from any of them.
With the job I've returned to, there are a number of colleagues who are my age or slightly older, who I've been very well able to relate to, whereas in the other job, I was the older, more experienced member of staff, and at times the office seemed more like a social club!
I think if I were in your shoes, I wouldn't expect too much from your work colleagues - you are already stretched for time, but perhaps you could find something outside of work and home which has peers of similar age & life experiences - volunteering perhaps?