Here is a follow up interview with Raj Kadam, CEO of Viralheat API whom we have interviewed on the Sentiment Analysis API here. In 2012, Viralheat had about 30 billion calls over all its' APIs. Viralheat just announced a new API called Human Intent API.
ParseHub, a web scraping tool,can be used in combination with textual analysis tools to collect complex and valuable data from social media sites like twitter.com. I used the sentiment analysis tool fromtext-processing.comto analyze the tone of 27,000 tweets, scraped with ParseHub. I used this