My experience with Italki.

In my personal opinion, Italki is a tool that allows you to meet know people from the other s countries. the People who are learning your language or people who will corrects your language (writing would be better)... One advantage advantaje is that people help me to learn more english words (You could say, One advantage is that people help me expand my vocabulary.) about english, and I see my mistakes also. I help them to learn spanish, because I have more experince with it. this language.
I like Italki!!!