Here’s a taxonomy of tweets from an experiment at SemanticHacker Blog:
- User’s current status
- Private conversations
- Links to web content
- links to blog and news articles
- links to images and videos
- other links
- Politics, sports, current events
- Product recommendations/complaints
- Advertising “posted from a company’s twitter account”
- Spam
- Other messages “that don’t quite fit under any of the above categories. Fan messages to celebrities, shoutouts to other users, web-based polls and quizzes, and so on.”