Kodak has made a great little public document called ‘Social Media Tips’. It’s very much oriented to companies and marketers who are just getting their feet wet in the social media world.
View the Kodak Social Media Tips PDF
I particularly like their 10 basic tips:
1. Know what you’re talking about
2. Always be transparent
3. Be yourself (avoid ghost writers!)
4. Post frequently
5. Add value
6. Respond
7. Listen to what others have to say
8. Learn from your mistakes
9. Be external (link to others, re-tweet!)
10. Have fun