I personally don't have any social media like FB but I was connected to him via LinkedIn. So he was able to contact me. I don't do social media. Regardless, as Lanie says, if he's that interested, sooner or later he'll find a way. If you are connected via social media, unless you are seeing things that make you unhappy like a GF, I wouldn't bother blocking it. But, if you see things you don't like, and cause you to fight to maintain your vibes, I'd cut him out. That's my personal take.