Many writers and readers are called to blog, whether for a journal of their writing or personal life, their reading life or their special interests. Copyright laws have been stretched to the limit by the scope of the blogosphere, up to 30 million blogs in the world by one estimate I saw. It might be wise for bloggers to revisit the topic of what constitutes plagiarism these days. One place to start is the blog site, Plagiarism Today. They have some helpful articles and a collection of related headlines. Nota bene: the bloggist advises that he is highly experienced but is not an attorney.