The Twitter API has taken a winding road since its initial launch in 2006. Since 2012, Twitter has continued to clamp down on API consumption and usage, often to the dismay of the developer community. However, Twitter continues to understand the value of API features to its growth and the developer community.
Our API directory now includes 945 social APIs. The newest is the SmartBots API. The most popular, in terms of mashups, is the Twitter API. We list [num] Twitter mashups. Below you'll find some more stats from the directory, including the entire list of social APIs.
The Twitter Streaming API has been successfully used by Yahoo!, Google, and Microsoft, who have been given access to the full feed of all public tweets. Twitter has now enabled this "firehouse" of data for a number of other companies.