R.C.
No, You are not over reacting 1) he is exploiting your son. And 2 worse -it is so very not Ok to have your sons photo with all that info on it.I would tell him he is endangering your son & you expect him to respond immediately for your son's safety. Go check and if he hasn't cooperated tell him that he's giving you no choice but to contact CPS and you will take it to family court mediation if you must.
At school all children are taught now adays that they NEVER give out personal info over the internet OR share photos with people they do not know.I would also complain to the dating service about their policy.The police even have bumper stickers on their vehicles that say " What About the internet?"
Take Care,
R.