This is rather unusual and weird. I was not on his friend list, but a few days ago I received a notification from a specific person to like his page. The only possibility I can see is that I might have liked one of his sponsored post. Wish I could show you guys the notification but since it is 2-3 week old I cant find it. Is there any method to randomly invite anyone to like your personal page out of the blue? Even if he has my email ID from LinkedIn or other sources, how did he do it??