Blogs: 

     A blog is a diary or journal.The writer or "blogger" can write his/her
observations on the world or provide links to useful websites.
Bloggers write about different subjects, sort of like a newspaper columnist
but with no specialized training necessary.So they can be described as
personal Internet journals.

     The first blog is said also to have been the first website in 1992.But
Blogs didn't really start to take off until the late nineties, however, and
they gained in popularity after 2000.