Is there something I can do? If you were him, what would you be doing?

i think just wait for him to reply your message. dont send him too many messages. and add him as a friend, and post childhood pictures on ur profile. just keep waiting, but dont expect much from him though. he probably wants his life to carry on as usual, so try to imagine u didnt find him on Facebook. if you expect too much out of him, u might end up disappointed and hurt. so just take it easy. yeah and all the best (: