Tinder, PoF, Bumble, OkCupid, it seems like everyone's on at least one today. Some of us have more or less success than others. What are the most common mistakes that guys (and girls) make, and end up holding themselves back? Usernames, descriptions, pictures, etc? Additionally, is it a scam? Are people really paying monthly subscriptions into dating apps to make their "upgraded" profile stand out?