Importance of a collaborative professional blog

I think that collaborating on anything is better than doing it alone. Two brains are better than one right? I found the 'attheteachersdesk' blogspot very interesting! I liked the post that talked about the children creating fake money to get real money to clean lead- contaminated soil. Because of this teacher's blog, I saw what they were trying to accomplish and maybe other teachers saw this too and made their students draw some fake money. I like how it mentions a blog as a digital portfolio. I have never thought about that before.