I’ve seen this weird trend. People are trying to do this because they say using the Netlify sub-domain gives them reach. This is the 3rd or 4th person asking this question. But, I suppose this thread is a duplicate of Redirecting facebook referral to the specific url
TL;DR: What you’re trying is not easily possible and I personally think, it’s not worth the efforts. But then I’m not a social media expert, so take that comment with a pinch of salt.