Now that I have my iPhone wired for sound, I do a majority of my tweeting and facebooking through the apps that I use. I use Instagram, which connects to my Twitter, Facebook, Flickr, Tumblr, Posterous, and FourSquare account. I use Hipstamatic and it connects and posts to Facebook, Twitter, Instagram, Tumblr, and Flickr, I use Posterous and it will cross-post to Twitter and Facebook.