The Rekognition API differentiates its feature set by processing images to recognize more than just the location of faces. Rekognition's technology will analyze a given photo and present a list of scenes, each with a probability rating. Faces are not simply identified, but are also classified for age and emotion.
Hootsuite added to its API portfolio with the Interaction History API. The API allows developers to monitor social media exchanges of its app users and other social media profiles. The goal of the API is to provide more context to social media exchanges. The API has Twitter and Facebook endpoints.
Twitter has added alt text support to Twitter Cards and the Twitter REST API. Alt text is an important piece of metadata for those who are visually impaired as screen readers and browsers use alt text to explain to visually impaired users the content of each image on a web page.