Yes, you can add people you know as a collaborator to any of your Artist Profile or Song Lockers.
You can also add people you know as a contact on TuneGO. Then you'll be able to message them.
In the future, you'll be able to connect with others in the music industry that you don't know. Such as producers, managers, labels, and more. They'll be able to discover you and your music on TuneGO.