What's new with you? uma simples saudação que pode te trazer um ar mais autêntico na língua inglês

That expression is very useful because it's a greeting. Ang we all know greetings are used all the time between two or more people that meet for the first time or not. What's new with you? That's a way to ask about the things that happened while you weren't in touch with the person.

On Facebook, I often spend a few weeks or sometimes months without talking to some of my virtual friends. Sometimes it's because one of us is too busy, other times it's just because it's easy to lose touch with people. Anyway, when I wanna get back to what things were when we first met, I ask them: what's new with you? And I'll get to know everything that happened over the course of time we didn't speak to each other. That's a very simple tip, but very important for those who like me love to talk to people on the internet and make virtual friends.