The humongous amount of data that Twitter generates daily, is spawning a new breed of company that is analyzing the data and providing value-added services on it. While the data mining and intelligence applications are still in their infancy, there are interesting applications that you can use today.
The semantic text mining Alchemy API is now a member of the API Billionaires Club. The service, which makes sense of raw unstructured data, averages 65-75 million requests per day, according to Alchemy's Elliot Turner. That brings the monthly count above 2 billion API requests.
The Votizen API aims to get friends to involve their friends in supporting candidates. The API website notes that the API is entirely based on HTTP. Votizen is based on the premise that, "Voters are more likely to listen to friends than campaign volunteers." Votizen is the first "social campaigning platform built entirely on personal connections."