I have been using this Twitter tool called Tweetdeck for a while now. It allows you to easily manage your account and keep track of your followers and those you follow. You can retweet something simply by clicking on the tweeters image. You don't have to keep the Twitter web page open all the time.
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Google has come out with a great service called Google friend Connect to help you add social media to your blog. By using the Gogle Friend Connect it makes it easy to have people join your Blog and allow them to interact with you and other members of your blog.
More on Google Friend Connect Add Social Media to your Blog
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