The great thing about Twitter is there is no wrong way to use it. Sure, you'll see missteps in etiquette and plenty of spammers, but for the most part it's like Thunderdome: There are no rules.
There are guidelines, however, and Proactive Report offers a handy tip sheet from Ogilvy 360 for advice on various strategies—and suggestions on who to follow, what kind of content to create and how to engage for each situation.
If you're a Twitter pro you will probably recognize the various suggestions, and perhaps have some of your own to add, but if you're going to be covering an event or handling crisis management for the first time with Twitter this is a great starting point.
