The Viadeo Node.JS provides developers access to information for integrating their node.js website or applications with the Viadeo API. With this SDK, developers will be able to interact their applications with the Viadeo API in Node.js.
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.
Twitter today announced that it is launching a new offering that will give developers access to the full Twitter archive which contains all tweets going back to the first one posted by Twitter CEO Jack Dorsey in 2006. Previously, full archive access was limited to Twitter's enterprise customers.
Popular social check-in service Foursquare is going through some changes, and the most important of those is that the old v1 API is going dead, as we've known since March. Older apps, especially abandoned ones, will stop working then, as will any newer app that hasn't yet upgraded to the new API.