Appetizer is a Mac OS X Client for the new social platform AppDotNet. It offers many features, is very fast & lightweight, and works on Lion and Mountain Lion.
Appetizer has support for all of ADN's important features, such as Global Stream, Starred posts, User Profiles, muting, reposting, tags, threads and more.
Appetizer can attach and upload images. Even more, you can take images with your iSight and apply effects on them a bit like on Instagram.