Social networking with your iPhone just got easier with Posterous. This iPhone app allows users to tap out a message and then with one or two touches of the screen send it to every social sharing site they belong to. You can check out their newly announced app and download it from their blog,

Effortless sharing from your iPhone has arrived with the new Posterous iPhone app.  If you are looking for a fun and simple way to update friends and family while you’re on-the-go, the Posterous iPhone app is for you.

Just touch post, add any combination of text, photos or videos and you’re ready to post.  You can add tags, share your geotag location or even mark a post as private straight from the app.

As the app allows you to update status, send pictures, video, it’s the Swiss Army Knife of social sharing apps for your iPhone.

The interface is dazzling, simple, and elegant so you can probably expect this to make quite the splash.  It’s definitely a step in th right direction, as it offers a dedicated mobile interface for the tool.  It will surely add to the mobile app-specific growth of Twitter, and hopefully curb Posterous from further encroachment by Tumblr.