Frick! Should've gotten his number! Is it too late?

I was doing reptile shows and the sound tech guy kept coming over to the displays and having a chat with me, also inquiring as to if I was working the next day. I finished my shift, gave him a handshake goodbye and he clasped it with two hands. I dunno if this is significant or not.

Kinda regret not getting his number or facebook details or something and I'm not working with him anymore. I know his first name, should I massively facebook hunt him? Or should I get another staff member to get his details for me? Or does he sound completely not interested and I shouldn't bother.

I know this sounds like some teenage drama but I'm kicking myself for not doing this in person, and just need a bit of advice.

Thanks, appreciate it