Twitter is definitely one of the best social media websites where you can create and grow your personal/professional learning network. Social networking now is one of the essential and uncostly means for teacher professional development. You don't have to wait for those twice-a-year PD sessions from your school district to improve your teaching practice and expand your professional insights, all it takes now is having an account in Twitter ( or other social media platforms like Google Plus) and you will have unrestricted access to the collective wisdom of the masses.