Hoop is an app that allows you to accept or decline a stranger's request for your Snapchat details, based on their looks alone.
You do not know who you are talking to.
This stranger now has access to your personal information.
If your location setings are on, they can also see exactly where you are instantly.
Unfortunately, despite your best efforts, you cannot ensure that you know who you are talking to.
It is very difficult to ensure that you keep yourself safe.
You should never arrange to meet anybody that you begin talking to online.
You should only send Snapchats to people that you already know.