An answer to how this is different is provided in literally the next sentence of the article.
>Federal Election Commission rules are unclear when it comes to Facebook posts, but even if they do apply and the facts are skewed and the dog whistles loud, the already weakening power of social opprobrium is gone when no one else sees the ad you see — and no one else sees “I’m Donald Trump, and I approved this message.”
>Federal Election Commission rules are unclear when it comes to Facebook posts, but even if they do apply and the facts are skewed and the dog whistles loud, the already weakening power of social opprobrium is gone when no one else sees the ad you see — and no one else sees “I’m Donald Trump, and I approved this message.”