I think I've put my foot in it.
I saw that DS's best-friend's Mum posted on FB announcing that she and her husband had decided to separate. No nastiness, he commented too and so on.
I was a little surprised and said to DS, who was sat next to me, "Oh dear, XXX's parents have split up"
DS was messaging his friend on Skype this morning who said his friends said his parents haven't split up. DS must have said I'd seen it on FB so the friend has asked my DS to send a picture (which he hasn't).
I feel bad that I've possibly been responsible for telling this child his parents are separating, but I REALLY thought that they would tell the children first. If I hadn't seen it on FB but heard it from someone else then I never would have mentioned it for fear that it was't official.