We’ve written about Plancast , a “Foursquare For The Future,” that essentially broadcasts your plans to your online social circle. We’re big fans of the startup, which just raised seed funding from an impressive group of investors.

We’ve written about Twitter client Sobees, which is working to create the best social media client on the market, competing with both TweetDeck and Seesmic. Today Sobees is releasing a new version of its Windows native desktop app built in .NET, complete with realtime search, a redesign and more. The new client includes support for Facebook, Twitter, MySpace, FriendFeed and LinkedIn (which was added late last year)

You may remember Akoha, a startup which launched at the 2008 TechCrunch50 conference which uses “mission cards” that friends pass to each other along with a mission ( i.e.

First launched back in April 2009, TweetPhoto has been steadily building out its service with multiple useful features, including Foursquare integration and a  partnership with Kodak. Today, the site is getting a huge overhaul with more social features and a new iPhone app. TweetPhoto has now added the ability to sign in with Twitter OAuth, Facebook Connect, MySpace OAuth and Foursquare OAuth so that a user of any one of these social networks can use TweetPhoto as a stand alone photo sharing service

Fresh off an $80 million acquisition by Shanda Games, Flash game advertising network and payments platform Mochi Media is launching a social gaming platform and a $10 million fund to invest in game developers.

As has been made abundantly clear to me over the past two weeks, just about every location-based service is planning big things for the SXSW festival , which starts later this week in Austin, Texas. A few of the players have already started rolling out small changes, such as aesthetic upgrades