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"Speaking of companies. Interestingly, language learning companies like Rosetta Stone, Alliance Française and Lingo Live are among the first adopters. So is MOOC behemoth Coursera offering a mix of free and paid tutoring sessions for its Machine Learning course. Notably there is a big group of language tutoring both from companies and private tutors in the Education & Career category, showing that this is still the easiest subject to bring online. Prices range from free over $5 to up to $25 per 30 minute session. Nevertheless other popular subjects like math are also widely offered. As Google Helpouts are built upon Google Hangouts features like screen sharing and document sharing, they also enable tutors to also teach topics that need more interaction or visual support."