
This is an fun and easy one. Just plug in your birthday (month, day, year) and then enter your Twitter username and password and you will have your horoscope, or Twittascope, tweeted to you every day.

I love, love, love this dashboard tool! Tweepular is a simple and fantastic way of seeing followers, people you are following but not following you, and people following you which you are not following. It will also have a tab of recent unfollows. Other tools offer similar stats put not in such an easy to use format.
This on is incredibly simple and fun. Just go to Twitlogo and put any your Twitter id (or for that matter anything!) and click "make."
There are advanced options that allow you to choose the size, and colors. It is totally useless but fun!
Not sure if you want to follow someone, but don't feel like scrolling through their tweet stream? As you add more and more people to follow (there will be more and more content in your Twitter stream), one of the most important factors when deciding whether you want to follow a Twitter user is what sort of content they tweet about. If someone tweets mostly about topics you don’t care about, they might not be the best person for you to follow.
WeFollow is a very simple tools that allows users to submit their own tags by sending a tweet to WeFollow. It uses these tags to help users find other people based on the topics they tweet about the most. The WeFollow site serves as a ranking and search service that allows users to find other followers based on their interests or location.
This is another simple tool that lets you share pictures on Twitter. You can post pictures directly from your phone or a computer.
This one scares people, but in reality it is really easy. There is only one main rule, which can be said for most anything on Twitter - don't over use it!One of the most popular ones (to date) is #followfriday. And also anytime there is a social media conference you can be sure there will be a hash tag. In fact, following people who are at a conference is almost as good as being there. People keep you up minute-by-minute of what is going on!
One last thing to note. If you want to creat a hash tag you should first find out if it isn't already being used. Search first, then post - Go to http://hashtags.org/ and search for existing hashtags in use.
If it is already in use you can leverage conversations that are already ongoing around your desired topic. And if you're interesting, they will follow you.
For more information, there is a really great article from Mashable on this.

FriendOrFollow is a simple tool that gives you a list of the people you are following that are not following you back. You enter in your Twitter user name, wait for the list to generate and then see who isn't following you. You can sort by a number of parameters if you are looking for something in particular.

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