This android app lets you video call with anyone all over the globe. And what's great about this is that you don't even have to register to login. You can always login in as a guest.

Wevo has simple privacy settings that you can always configure to your liking. You can choose to reject all private messages or accept only those from registered members.

If you dislike seeing or getting notifications, you can always turn them off or enable them anytime you want. 

Wevo has a lot of chat rooms that you can enter. If you want to start your own, you can go ahead and create a new one to meet other people.