This package is a PHP library for the Twitter API. This unofficial Twitter library provides full access to all of the API's functions. Extensive documentation and example code is available at the library's home page. The API is provided by Jublo Solutions under a GNU General Public License. Note that use of this library requires PHP 5.3.0 or higher and OpenSSL extension.
Every single public message on Google Buzz, the content-sharing platform from the search giant, is now available to any developer. A similar, if much fatter, pipe is available from Twitter, but only for large partners paying big bucks. Accessing the "firehose" is about the same any other API, which makes it an easy way to get a lot of content quickly.
Hellotxt, the service that lets you simultaneously update your status and read your friends' status across many services, has now released an API. There is a long list of microblogging and social networking sites that Hellotxt interacts with, ranging from Facebook and LinkedIn to of course Twitter and FriendFeed (see their home page below).