On my FB accounts, there are many JWs and ex-JWs.
The actives may acknowledge the date of birth by writing, 'We're so happy little Suzy has come into our life.' Never, however, have my JWs written the worldly expression. I, a fader, tell little FB friend, Suzy, that I am happy she's a part of my life. She "likes" my comment.
The exes will say "HAPPY BIRTHDAY!" Of course they will. Actives and exes are friends on FB.
Strangely, active Witnesses have every sort of theme party, based largely on popular movies, fantasy characters, etc.
My, my -- getting far too close to the edge . . .
CC