Just send the people on italki that are native speakers of the language you are studying. Take you, an english learner, for example. Just send some messages to english speakers asking to be friends. Most people are nice enough to accept, but try to find someone learning chinese so then you have more in common to talk about. Not everyone will answer you, but nice people, who are interested to be your friends will. So, if only nice people answer you, then you will only make nice friends.
If you want, we can speak in english, I'll help you. You can add me!