Social media includes the sites mentioned earlier, but it also includes blogs, podcasts, wikis and more. Blog is short for Web log. Anyone can start a blog, and anyone can comment on the original blog entries. It is a unique and compelling way to get a dialog going on a particular subject.
Unlike a magazine article or column such as this, a blog provides a ready way for readers to react to what is written. If you don't agree with what I am writing about in this column, which you are likely reading in the printed magazine, you need to go to your computer, bring up your e-mail software and write me a note. Your comment only comes to me, and I can choose to share it or not. With a blog, you are right there reading it online, and can easily enter a comment, which is visible to anyone else reading that same blog.