Along the lines of Hootsuite, Twitterdeck, and the like comes another social media management tool, Social Oomph, http://www.socialoomph.com/. Social Oomph allows you to Schedule tweets, Track key words, Extend your twitter profile, save and reuse draft tweets, Set up automatic thank you to new followers, Has a URL shortening tool, Automatic following of those following you, Facebook features, scheduling of blog postings, and more.  There are 2 types of accounts, free and paid, and all the benefits I listed above are free.