15 Essential Time-saving Tools for Busy Writers by Bryan Collins lists 15 writing tools that will save you time and help you become a more productive writer.
Hootsuite
Analytics: Three Keys to Building Your Author Platform
Analytics: Three Keys to Building Your Author Platform by Dan Blank of WeGrowMedia.com explains how authors can use HootSuite, Tweetreach and other tools to measure their social media activity.
5 Top Tools for Promoting Your Book on Twitter
5 Top Tools for Promoting Your Book on Twitter by Steven Lewis describes Klout, Tweepi, Tweriod, Hootsuite, TweetDeck