Finlandia Vodka's Finnishing School (get it? Two "n's". Ha.) offers shakers tips and trips to balance the perfect drink. The instructors are no slouches either. Tony Abou-Ganim and Dale DeGroff support the instruction, so you know you're learning from the best.
This app is one of the more robust Facebook attempts I've seen. It allows users an engaging experience without jumping all over the place. The video lessons look as though they have a time stamp, so watch the videos while you can.