1. Post 3 times a week. Schedule posts in advance. In reality, 95% of medical bloggers probably quit within one year.

2. Use your blog to collect interesting ideas and share/comment on health news.

3. Write some original content, if you can, but if you don't have time, that's OK. You have a more important job as a physician in real world.

1. Don't disclose patient information.

2. Don't offend people.

3. Don't be unprofessional. If you use your real name, it's better to let your employer know about your social media activities. It's OK to start an anonymous blog/Twitter account to test the waters.

1. Provide expert info on health news and diseases. You, as a doctor, are the one who actually knows what he is talking about - if you stick to your area of expertise.

2. Collaborate with like-minded people.

3. Gather feedback (including critical feedback) for your ideas.

4. Grow your practice by providing high-quality actionable info to patients.

1. Start a blog.

2. Get useful feeds in Google Reader.

3. Share ideas and communicate on Twitter and Facebook.

Speaking from personal experience, I've started more than 30 blogs and still keep around about 7. It's important to find a purpose for your blog and other social media activities. If you don't enjoy it, you will stop eventually. Set limits and respect other priorities. Your family and your patients come first, blogs and social media are a distant second - if you spend most of your time in clinical medicine, of course. Stay away from trolls and online personas looking to start a fight. Ask for help when you need it.

References:

The Social Media Conversation
Social Media In Medical Education