Tweetie was a client for the social networking service Twitter. There was a mobile version that ran on iPhone, iPod Touch, and iPad, and a desktop version ran on Mac OS X Leopard, Snow Leopard and Lion (respectively 10.5, 10.6 and 10.7).
Both the iOS and Mac versions of Tweetie were acquired by Twitter on April 9, 2010, and were re-released as the official Twitter clients for iOS and Mac.
History
Tweetie 2.0 for iPhone was the first app to introduce the pull-to-refresh[1] user interface mechanism. The Mac OS X version of Twitter had many of the same features as its mobile sibling. In addition to a free advertising supported version, the paid iOS and OS X versions cost $2.99 and $19.95 respectively. The beta of the Mac version was leaked to the popular torrent site Demonoid a week before the official release.
Acquisition by Twitter
On April 9, 2010, Twitter announced that the company had acquired Tweetie.[2]