Improtance of Learning English and blogging

Do learners learn english by using blogs and blogging, podcasts?

Check out these websites. 

http://www.testintel.com/podcasts/better-process-innovation-show

http://www.testintel.com/podcasts/scientific-american-podcast

http://english-summer.blogspot.com/

Read books and articles  on Importance of learning english

 Learning English - A Global Necessity

Learner Perceptions Of Using Blogs In English Learning - Instructional Technology-on Line Journal

Eugene Huang (Paperback - 2008)