The Python Foursquare V2 Library is a wrapper for version 2 of the Foursquare API. It provides automatic retrieves, full non-merchant endpoint coverage, full test coverage, useful exception classes, and multi support.
LinkedIn has just announced that updates have been made to the LinkedIn Developer Platform to make it even easier for the development community to "use LinkedIn as their main distribution platform for discussing and sharing professional content." One of the key ways sharing professional content will be expanded is via the upgraded Share Linkedin API.
APIs serve up a lot of valuable data and resources, but the most valuable API currency right now is social data, and specifically public data from Twitter. APIs are essential in not just accessing this social data, but also delivering meaning extracted from this firehose of social data.