I came across this great slideshow detailing some key tips for using Twitter if you’re a journalist. The same tips apply for bloggers, or anyone who likes to publish content online.
The main message here is: Be professional. While some people think of Twitter as casual and fleeting, the truth is, any Tweet can come back to haunt you, at any time. And while slang may make your Tweets shorter, they also make them hard to read. Spell correctly, write cleanly, and communicate fairly.