TweetDeck, originally just a Twitter tool, now it does so much more it can serve as a social media dashboard. And, it’s free. TweetDeck software is available for desktop, iPhone, iPod Touch, iPad, Android devices and the Google Chrome browser.
A key advantage of TweetDeck is the ability to have an unlimited number of vertical columns with which to categorize conversations. You can have a column for your entire Twitter network, plus columns for @ mentions, direct messages, hashtag searches, Twitter usernames, and keyword or phrase searches.
TweetDeck also enables you to publish posts immediately or schedule them for a future day and time. To schedule tweets, you simply set the day and time you want the post to be published. It will appear in a new column as a scheduled update.
TweetDeck allows you monitor a number of Twitter accounts.
On TweetDeck, you can also add your Facebook, LinkedIn, Foursquare, and Buzz networks to view status updates from each of those networks in their own columns in TweetDeck.