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The audience at the Bell Harbor Conference Center in Seattle was full of geeks, and its members would probably have been proud to identify themselves as such. After all, it was the ninth Gnomedex conference, the annual gathering of tech bloggers, business types, private tech enthusiasts -- anybody and everybody who has a fascination with technology's impact on society, culture and media. Most of those attending were using social media long before "social media" became the easy buzz-phrase to describe a revolution in communications.
I don't think you have to define yourself as a Twitter user or journalist/blogger..I think both are not mutually exclusive, same with other networks such as http://gamefriends.com , fb, or myspace.