November 30, 2011
The Salsa Commons API is a REST and XML API that, as Salsa explains, "At it's simplest, using the Salsa API may consist of just a form placed on an external website ... At it's most complex, you could use a Ruby library to authenticate, pull down information on recent supporters and events, validate that data, change it, and submit it back to the node, while generating and displaying counts of petition signers -- all through the API."
Facebook has announced that it will soon upgrade Graph API v2.3 users to v2.4. The automatic upgrade will take place on July 10th as part of Facebook's 2 year deprecation cycle. Significant changes from v2.3 to v2.4 require pre-migration attention from developers to avoid app disruption.
There isn't just one social graph, there are many. LinkedIn maintains your professional contacts, while Facebook has friends and family (and yes, often many professional). Twitter has some mix, as well, perhaps with a different filter. Aggregators take these disparate contacts and bring them into one place. A new service uses several APIs to merge them and give tools to better understand and utilize your network of contacts.