Involver launched its Engagement Optimization API last week (read the official release here). Partners are utilizing the API to "optimize their ad spend on social in the way they've been doing across the web for a long time." Although advertising across social networks has been deployed for quite some time, advertisers have had limited tools to track engagement. Facebook Insights is probably most commonly used to analyze social data. When users have required deeper analysis, the advertisers were forced to use highly custom integrations.
Here is an interview with Jeh Daruwala, CEO of Yactraq.com . Their work brings machine learning and natural language processing to the potentially blockbuster world of online videos for targeting of ads based on behaviour. Thus the ads are less spammy, much more relevant, and a win-win for audiences, advertisers and content channels.