1. Be yourself, but beware. Say whatever you feel like saying, but remember that whatever you write could exist in the digital universe forever. Proceed with extreme caution.
2. Don't be afraid to interact with others. If you like something they say, reply by clicking the little grey arrow that appears when you hover over one of their tweets. You can also simply type in @username (replacing "username" with whatever their username happens to be on Twitter). This is the formal way to address someone on Twitter.
3. Follow celebrities. They may never interact with you, but at least you can interact with them. It's no longer a question of who is on Twitter -- but who ISN'T on Twitter.
4. Use Twitter from your desktop. Twitter has something called an API (Application Programming Interface), which allows programmers to create experiences around Twitter for the community. Because of this, there have been an amazing array of applications released that will allow you to manage your Twitter account easily. There's Twitterrific, TweetDeck, and Twhirl -- just to name a few.
5. Find friends fast. If you're looking for new friends, a quick search for some of your favorite things on search.twitter.com will quickly reveal who you should be friending on Twitter. Maybe they'll follow you back?
6. Follow government officials. If your elected official isn't on http://tweetcongress.org, then they're behind the times. Heck, even the Library of Congress is on Twitter!
7. Crowdsource. If you have an idea, or a question, don't hold it in -- let it be known to all! Who knows -- someone just may answer your call for help.
8. Tweetups. Keep your eye out for these things. They're meetups for people on Twitter, and there's likely one happening regularly in your neck of the woods. I've taken to hosting one monthly in the Seattle area, as a matter of fact. Meet Twitter people -- tweeps, tweeple -- in meatspace!
9. Retweet. If you like something that someone else has tweeted, you can "RT" (retweet) it. This gives the original person credit, and also lets your followers know what you like. That's community!
10. Go with the flow. If you think you know better than everybody else, you're wrong -- the same netiquette rules apply on Twitter as well as on the rest of the Internet.
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