Allow people to comment on posts. Blogs are regarded as informal and perhaps irrereverant avenues of communication
Early blogs were simply manually-updated components of common Web sites . However, the evolution of tools to facilitate the production and maintenance of Web articles posted in reverse chronological order made the publishing process feasible to a much larger, less technical, population.
Used by companies to control access.
Technorati now claim to track 112.8 million blogs
Here's Twitter's self-description: "A global community of friends and strangers answering one simple question: What are you doing?"
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