Always be Professional:

Like any career, if you want to become a writer you need to always be professional. Keep your cool, try to remember this is a job. By being professional you're learning to become a writer.
- John Passerella

Always act professionally, online and in person, in verbal and written communication, when you tweet on Twitter or update your Facebook status. Authors talk to each other, and editors talk to each other. If your goal is to become a professional writer, it's never too soon to start presenting yourself professionally.