Twitter has been beta-testing Gnip?s Audience API since last October, and the social network announced Tuesday that the application-programming interface is now available to all advertisers.
Data product manager John Heywood wrote in a blog post that Twitter spent the nine months since Gnip?s Audience API was introduced at its Flight Developer Conference ensuring that its audience insights product meets the following requirements:

Deliver information not available via analysis of public content.
Return insights in real-time.
Seamlessly integrate alongside existing Gnip APIs.
Protect user privacy.

Heywood offered more details on the general rollout of Gnip?s Audience API:
The Audience API allows customers to retrieve demographic data across 10 user models, as well as at the intersection of a combination of any two. Realizing that these models also power Twitter?s suite of advertising products, it has never been easier for brands to understand target audiences and create content that resonates with each group.
At Twitter, everything we do is oriented around our users, and the Audience API is no different. Of the four product requirements shared above, the most important has been to protect our users and preserve the trust they have in Twitter that their data will be used in an appropriate manner. The approach we have pursued is grounded in probabilistic data aggregation and differential privacy, and our continued work in this area has allowed us to maintain the same le...