Do you like keeping up with friends on social networks? Do you have an iPhone? If so, you might be interested in a new social networking application for the iPhone called Ziibii. Ziibii [iTunes link] brings an innovative approach to viewing your social networking sites and RSS feeds -- without ever leaving this one app. Ziibii allows you to see friend updates, videos, and photos from Twitter, Facebook, Flickr, and YouTube.

Ziibii's killer feature is its "River" feature, which depicts friend updates, photos, videos, and RSS feed headlines "floating" down a river on tiny rafts. You can interact with the river and rafts with gestures. Moving too fast? Move your finger left or right on the screen. You can even make the river flow in the opposite direction by swiping your finger against flow.

Rafts too close together? Pick it up and move it. If you tap on a raft, you will be presented with a full screen view of the update and get the option to share that update via email or Twitter. If you get sea sick with River view, you can also give list view a try, which stacks updates on top of each other; swiping right to left loads more updates.

Ziibii comes pre-loaded with some good blogs (TUAW is listed under the "iPhone Stuff" section), and you can also add your own RSS feeds via the "My Feeds" setting.

Ziibii has a very nice user interface, and allows you to quickly see all of your friend updates in a unique fashion. However, we would like to see an option to post updates and photos to Twitter, Facebook, and Flickr. We would also like to see support for Pownce and Digg, among others. With the price of free, Ziibii is a must-have application for anyone that uses social networks. You can download Ziibii from the iTunes App Store.