Re: communicating with your boss through facebook
If she updates her status on FB with such things, then it’s obvious she wants some comforting and attention through this difficult time, as FB status can be seen by all of her “friends”. 
I’m not too sure as to what is the right thing to do…
By offering her a “shoulder to cry on” she might end up using you as her work blanket… thus offloading all her emotional baggage onto you, which is inappropriate and will probably affect your working relationship with her.
But on the other hand… if you can blatantly see that something is wrong, i think it’s pretty heartless to not offer any words of comfort… so maybe try to find some middle ground?
This is why, if i was currently working, i would never add current colleagues… you’ll start to see them in a different light and it will inevitably affect your professional relationship. Having said that, i guess adding ex colleagues is deemed as ok.
The moral of the story - use sites like LinkedIn to network professionally.