For the less socials teens, it's much easier for them to play an online game with each other than to actually meetup in person. I would know, because I used to be one of them.
Meeting together in person used to give me tremendous anxiety and as a result I would always vouch for taking the easy way out. In hindsight, I wish I had actually made more of an effort to hangout during my high school years because deep down I did enjoy those personal interactions. Nowadays I'm a lot more social than I was in the past and a lot more happier as a result too.