The Meetup Java SDK by Meetup provides API interaction to access community features that can be implemented into social applications. Sample code presents client settings, event search criteria, and list of events.
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."
Where were you when Hurricane Sandy hit, and what were you doing? If you're like many other ProgrammableWeb readers, you weren't watching news reports on TV--you were using social media to keep tabs on your friends and family, and taking advantage of the vast amounts of data available on the Internet to make sense of the situation. Below, a round-up of how Twitter and other online resources helped people get through the record-breaking "super storm."