External pages banhammer

I have some external fanpages with like->share->gateway script. Not much fans because I wasnt doing FB for a long time.

I saw some pages with LIKE button error and as I heard, it means that these pages are banned.

How exactly this kind of ban looks? Is it just a url or domain block?

How many likes it usually needs to be banned?

if you get an error then you are either liking a blocked domain or the like button resides on a blocked domain

A blocked domain, yes.

Is it hard to get a domain banned? How many likes it needs? Any idea? I saw external pages with XXX.XXX number of likes working...

Fb blocks your domain,they cannot ban your site,it all depends on how you promote and how much traffic you are getting,if your page is growing too fast then you get banned very fast and some people showing off fake numbers too,recently i came across to a site which shows xx,xxx,xxx number of likes,its all fake and bs,so it has no specific number or anything,you may get banned after getting 5k fans or you may even get banned after getting 500k+ fans,so theres no fix number!