Hello,
Well, It depends. I think that the question can be divided in three. I'll reveal three secrets tricks here. I've been using for a long long while now
1. How to grow facebook page with low quality BUT REAL followers?
Answer 1: Very easy trick with Facebook Ads. Just search a love/heart/11:11, caption it with "Do you like to spread the love", use "fan page likes" objective, target WW clients. And you will get amazingly cheap followers.
Bad side? Well, those followers will be real, but not interested in your page. Is just for social proof, good if you are managing a shopify store or eComm. Not good if you are trying to grow a personal brand/page.
2. How to grow facebook page with good quality followers?
Answer 2: Use Facebook Ads with "fan page likes" objective, upload the best VIDEO you can have, caption it with just two phrases. In captions, write: "LIKE my page @YourPageName" and that's it. That simple CTA will work wonders.
3. How to grow facebook page with insane quality followers?
Answer 3: Use Facebook ads with "VIDEO VIEWS or INTERACTIONS" objective... do the same as 2. point, but this will be really high quality followers.
Note: Facebook Fan Pages are dying slowly. I mean, they will always exist, but organic reach is dead AF lately. Why? As Mark Z. Itself claimed, they want to make Facebook as it was in their first days. When the content you look at in your news feed is from family and friends, and no memes, or something like that. That have killed organic reach. I manage a 300k VERIFIED facebook fan page of an artist. It used to have like 3-5k likes and 100-300 comments per post. Now hardly it reach 1k likes.
Cheers,
David.