[lobotryas]

Good point. I'd say the answer is to try and obtain access to more data. Imagine if you had access to the Facebook "firehose" and could analyse every single FB message, wall post, Like and so on. I would say that Facebook is a better representative of the general population than Twitter and with time you could tune the model to provide insights into user sentiment. Would be cool to see what the userbase thinks about X brand and if that brand wants to pay in order to boost its user sentiment on FB.