Can someone tell I've seen their Facebook? I think he can...?

[Sarah]

So I have a crush on this guy... but could never date him... we disagree on everything especially politics and he is very aggressive about his views. I always ogle over his facebook though bc he is so dreamy. Recently I posted an article that was political which I'm sure he disagreed with and he soon after made his status, " Maybe you should stop trolling on my facebook and grow a brain" In the comments he called his "creep" too "dense" to even know he was talking about them. I have NOT made it obvious to him or anyone I like him but he somehow knows I look at his fb a lot? Is that possible or am I being paranoid? We never otherwise talk and live in different states. How could he know?