I am curious to know:
Which languages are most popular to learn on Italki?
Which countries have the highest numbers of users?
I tried Googling this but I couldn't find anything. Thank you!
You are the best!
I doubt if you will ever find the information that you are searching. italki does not disclose anything in terms of revenue stream, advertising, total number of premium members , etc. Hope I'm wrong for your sake, but I doubt it.