In the 21st century, networking has moved from face to face meet and greet and trying to get meetings with other professionals to social media and instant contact. This has both positive and negative repercussions. A teacher can interact with their favorite teacher, author, or inspirational speaker without leaving their hometown. But it also can be overwhelming at times wiht access to so many people and tweets.

Another informative online article on the benefits of using twitter to build a professional learning network is "10 Great Guides for Better Professional Learning Network". The article discusses the importance of a Professional Learning Network and professional growth.
The following is a quote from the article "50 Great Ways to Grow Your Personal Learning Network"
"Twitter has quickly become one of the best tools in any online learner's arsenal. Use these tips to make the most of your Twitter interactions"
Below is a video from "Teachers Guide on Creating Personal Learning Networks" about the importance of PLNs and the use of social media to create, engage, and maintain them.
Twitter is easy to use, you only need to type 140 characters at a time, and you can see what other people with like interests and questions are saying. Once you sign up you can just follow for a while and then as you get the hang of it start tweeting .
source:
http://www.educatorstechnology.com/2013/01/10-great-guides-for-better-professional.html
http://www.educatorstechnology.com/2012/11/teacher-tutorial-on-creating-personal.html
http://www.edutopia.org/blog/twitter-expanding-pln
http://www.onlinecollege.org/wp-content/uploads/2011/10/pln/twitter.jpg