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Re:Ask HN: Social aspect to financial markets and stocks by mrkmcknz on Saturday November 19, 2011 @02:07PM (#3255944)
The StockTwits API is great if you want to build a sentiment based tool.

Again as murtza said negative sentiments are often more correct than positive.

The only problem is when it comes to monetizing the thing, the hurdles in legal terms then become huge and costly.

Re:Ask HN: Social aspect to financial markets and stocks by verdatel on Saturday November 19, 2011 @02:45PM (#3256032)
what are the legal hurdles you envisage? A simple recommendation based on social sentiment is what I'm thinking about.