...^^^...An article telling why do we have to use blog in ELT...^^^...

What is blog?
      A blog  is a type of  website or part of a website. A typical blog combines text, images, and links to other blogs,  Web pages, and other media related to its topic. The ability of readers to leave comments in an interactive format is an important part of many blogs. Most blogs are primarily textual, although some focus on art (art blog), photographs (photoblog), videos (video blogging or vlogging), music (MP3 blog), and audio (podcasting). Microblogging  is another type of blogging, featuring very short posts.
    
 Why to Use to Blog?
                    Completely free – This is of course one of the main reasons why I use Blogger to blog! Of course, many other blogging services are free but read what you get with Blogger in following text!
              Advanced Customization – Blogger allows you to customize your blog the way you want to customize it! It’s little bit complicated to customize (compared to other blogging systems), but you can do much more on Blogger definitely with your site design!
             Domain Hosting Support – Blogger is service that allows you to host your own domain name completely for free! Other similar systems usually charge this option – but with blogger you can get it for free!
            Space and Limitations – With Blogger you get completely free 1 GB image hosting and not limited bandwidth! That’s very good and enough for 99% bloggers!
           Scripts, Widgets and Gadgets – Blogger have collection of some good and quality widgets and gadgets that you can use! Including support for scripts and advertisement codes. Allowing you to fully customize and put on your site whatever you need!
         Comments, Moderation, Categories and Archives – Blogger supports comments and comment moderation as long like Categories and Archives – Everything you need to have on your blog!
         Secured – Blogger is free hosting service for blogs owned by mighty Google It’s very secure and trusted service – much more secured than self-hosted systems!
         Collaboration Support – Blogger have very good collaboration feature that allows you to have multiple moderators that can post / edit your blog!

Reference : http://en.wikipedia.org/wiki/Blog
                   http://www.bashbosh.com/why-to-use-blogger-or-blogspot/