Blogs for Anthropology

I like the idea of blogs and am brainstorming ways to incorporate blogs into my anthropology courses. I can certainly see a role for blogs in my Writing Intensive courses. For my non-Writing Intensive courses, possibly switching from forums to blogs could be productive. Some concerns:

-How does turnitin.com (preventing plagiarism) align with edublogs?

-Do students write more informally with blogging rather than scholarly/academic writing?