The American Society of News Editors says it reviewed the social media rules of leading mainstream news organizations and identified "the best-practice themes at the heart of the best policies."

The 10 key takeaways:

1. Traditional ethics rules still apply online.
2. Assume everything you write online will become public.
3. Use social media to engage with readers, but professionally.
4. Break news on your website, not on Twitter.
5. Beware of perceptions.
6. Independently authenticate anything found on a social networking
7. Always identify yourself as a journalist.
8. Social networks are tools not toys.
9. Be transparent and admit when you´re wrong online.
10. Keep internal deliberations confidential.

Reaction to the guidelines
* Steve Buttry: Good advice, but too much fear and not really "best practices"
* Joy Mayer: Good advice interspersed with real missteps
* Cory Bergman: Good recommendations, but one is more destructive than helpful