Twitter recently added more data to each tweet it returns via the API. Now your applications can access the number of retweets, whether you have retweeted a tweet and additional information about the user who wrote the tweet. The new information used to require subsequent calls to the Twitter API, or perhaps looking up a cached value from your own database.
As business computing migrates to SaaS applications, developers must address the problem of the data silos the software creates. APIs let you move data in and out of these online applications but, they present a new set of problems: managing data in several applications using several APIs.