Blog:aberrations each according to his intelligence and the things that interested him.
Blogosphere: All blogs online, all virtual logs. Blogosphere could be forcibly it online, but this depends on many factors.
Blogger: owner with legal papers of a blog.
Blogroll: Blogs that resembles a kind of 'birds of a feather flock together'.
Articles: Special pages on a blog where a subject is presented, displayed, discussed, analyzed, outliers, etc..
Reviews: reviews from other bloggers vis-a-vis the subject presented in the article.
Table: assessing an article on another blog.
Google: monster with a human face that provides relevance searching, sometimes.
SEO: spammers industry and their success.
Social networks: stupid children.
Conclusion: The blog is an outstanding achievement: God gives the man who invented health (if a longer life).
There are many ways to spend your free time. I really do not understand how some prefer to sit at the computer and display their opinion on a blog, you could make things more interesting, like: to go into a pub, to see a soap opera or a football match in division 3, or very nice things without longer blunt mind, without having to think too much thinking is tiring. Be rest!