Kool Jo, I've emailed or contacted several disfellowshipped people through Facebook. I let them know that their JW status no longer matters to me and that if they need a friend, an unconditional one, I am available.
So far, it's turned out good and they have been thankful. But I haven't discussed the truth about "the truth" with all of them. That is where things can get tricky.
I say give it a shot. Why not? It seems like one of the best times to aid someone to open their eyes.
CoC