Yes you are right its missing in Account Area.
You are right, but OP is asking in general terms, if any one in general terms want to send an invite than there should be an option available for normal users, might be it has been disappeared due to bits system. I hope @M can highlight some light on this query.Referral Links are against the rules and can cause your account to be banned.
This has been implemented. You may click on your username and then "Your referrals" to find your link.
I haven't seen any referral Link.
I haven't seen any referral Link.