Flickr has released an updated version of its iPhone app, specifically targeting new features of the iPhone 4 like multi-tasking and support for HD-video uploads.

"The version 1.2 adds multi-tasking and allows users to upload their photos and videos in the background," a representative for Flickr tells WebProNews. "After tapping the ‘Upload’ button, you can simply do something else; no longer do you have to watch the progress bar until it’s finished. When multi-tasking, we’ll always bring you back to the same place where you left the application."

Flickr has also introduced a new Twitter sharing feature in the app (which doesn’t only apply to iPhone 4 users). Users can upload a photo or video to Flickr and post its short flic.kr address to Twitter followers at the same time. Users must link their Flickr accounts to their Twitter accounts obviously.

"In addition to the cool features, we enhanced the overall user interface, provide the option to clear your recent searches and developed an even better full screen browsing experience – once you swipe to the next photo the navigation controls disappear and you can enjoy the photo," the representative says. "Not sure how to enter the full screen mode? Just tap the photo on a photo detail page in the app."

The app can be downloaded in the App Store for no cost.