Popular social media client Seesmic has launched some new updates for its iPhone app. It now supports Retina Display, creating and adding users to Twitter lists, in-reply-to-converation and direct messages in threads, checking private Facebook messages, pull-down to refresh, and Instapaper & Read it Later integration. 

Seesmic for iPhone now takes advantage of the Retina Display for newer iPhone and iPod Touch devices for a visually improved interface. We also take advantage of Multi-Tasking with Fast App Switching," says the Seesmic team. "A simple pull-down of the timeline, will load new content. We’ve also added infinite scrolling to load additional updates seamlessly when you arrive at the bottom of a timeline."

"If you spend a lot of time with Replies and Direct Messages, we’ve organized it to provide you the ability to view your replies and private direct message in a threaded conversation view," says the team. "We’ve also made some updates to manage your Facebook social stream. The Newsfeed has been updated for easier viewing, and you’ll be able to now read your private messages inbox. You can now also take advantage of being able to view the list of your friends, as well as see their profile."

The List support is probably the most welcome new feature for avid Twitter users. Lists are a big part of how a lot of people use Twitter these days, and Seesmic is still a popular avenue for Twitter usage on mobile devices. 

Seesmic says it is also experimenting with monetization efforts for its iPhone app, with the use of iAd in the US Market.