Can you tell me exactly what to be used in content part to update this feature?
No, I can't. But Facebook presumably can - in fact, they probably already have. Have you checked the HTTP response from Facebook's web server when you post? That is where any error message they are giving you can be found.
my $result = $m->post(...);
warn $result->as_string;
Have you checked Facebook's documentation for their API?
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
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