Initially, when we ended things my ex blocked me. Several days later he unblocked me and I was able to see everything in his life. Later, I learned that this was on purpose so that he could parade his new supply in front of me to make it seem like I was missing out.
I think it's human nature to check someone after you break up with them. We want validation that we're doing better than they are emotionally with the breakup. But social media only shows what you want the world to see; you won't take a selfie while you're crying over a pint of ice cream.