Sending OX to total strangers is creepy, but I wonder if it is just something people nowadays sign off with, without really thinking what these symbols mean.  I sign off all my messages to my daughter with  Love you ......... (my name) and xxxxx

The other day I wrote message to my daughter, then to male acquintence, and signed off in his message the same as to my daughter.  OOOPS!!!!!!  Wonder what he thought of it, but he did not mention anything, and I have since signed all my messages to him my usual considerably more formal way.