if permanent block you never recovery youre facebook account
ussualy only choose name with photo in your friendlist ussualy 5 firend
another send document same with youre facebook name
As far as i know based on my experienced blocks do have specific duration but sometimes you would really need some verification which is commonly on identifying picture of your friends or do make submission of your ID documentations towards your identity.I havent experienced such block posting out crypto related post.I dont know that they are already starting it out yet i have done on posting some related stuff.