Thinking about it...
Facebook must be in communication with Ebay. When I clicked on your link and visited Ebay, it passed the information to Facebook which then began creating ads - claiming that one of my friends, Trevor, "likes Ebay."
Trevor has probably never heard of TacLights. Facebook and Ebay are acting in collusion, though, and are willing to use his name to entice me to buy. Pretty scummy of them.