Having worked in this area, both as a client and as a consultant, customer understanding is a key to differentiating yourself from your competition. First a personal belief: surveys are the worst tool to uncover any insights. They are best used to quantify how many do X. There are a couple of wa...
I think you are missing the market research step. You need to ask the people that you would be targeting, because at the moment, I'm unsure why someone would use your product, over say using a platform where they can hire an online tutor and learn from them, or use Rosetta for example. I get that...
An undervalued tool in this case is understanding the niche of your product or service determines the best 'tool' to identify your audience. FB Audience Insights is useful if FB is your primary means of social. If you are utilizing Twitter (and you should be), use bit.ly. Even the free version gi...