As announced earlier this year, Google officially retired the Hangouts API. As Hangouts is repositioned for enterprise use, the need for some of the social, consumer focused video features of the API are no longer a priority. Accordingly, the end of the API was first announced and now realized.
If you are looking to display social networking statistics on your site, Shared Count just showed up with about the simplest tool you could ask for. Given a URL, the Shared Count API will contact the APIs of Facebook, Twitter, Google Buzz, Digg, Delicious, and StumbleUpon to retrieve their statistics.