I’ve been a big fan of TweetDeck for quite some time. It’s my go-to “mission control” app for Twitter. I generally have somewhere between 20 to 30 active panels of various searches, hashtags, and lists. The latest version of the TweetDeck desktop client incorporates “real-time streaming.” The nifty thing about TweetDeck is that it is available as a desktop client and as an app for iPhone, Android-based phones, and the iPad. If you want to leverage the power of Twitter as a communications and marketing platform, TweetDeck is by far the best free app for staying connected.