I have to be quick... work calls! So I haven't thought as much as I would like.
My first reaction is to just chill, and let both the FB and the text go. Mostly to make sure that he understands you are not hanging on his every word or action.
When you see him you could mention how well you thought he did with work today, or not.
If you sent the text you are thinking about, I don't think it would be a disaster, by any stretch. Just that my first reaction is not to.