OK, here's an arguement against demanding blogs for potential job candidates.

Questions about race, religion, creed, sex and age are all prohibited during the interview process. However, race, religion, creed, sexual practices and age are all prime topics for blogs. So, if an employer turns down a candidate after reading the blog, does the candidate have a legal suit against the employer?

Discuss with your lawyer in the toilet, or just search for "Illegal Interview Questions".