Yes, it is. Wingman has been around for a few years, and despite not having a big user base, it has a few hundred thousand installations and mostly positive reviews.
First, your friends (or “wingmen,” per se) need to approve your potential matches, and then you can chat – just like in every application on your phone.
Yes, as your data is encrypted and the moderation team is constantly searching for fake accounts and illicit behavior to remove from the app.