First, I have to comment on all the linkages to standards... very much appreciated! Very good!
I like the focus of the assignment. It's something that is realistic and sends a strong message to students about their agency in society. The interactive components are the strength of this assignment; allowing students to talk to each other as well as citizens through their blog posts will really help create understanding.
One concern would be the level of technology it is necessary for students to know how to navigate. You might consider building in some tutorials online or in some othe format, in case students need help starting up their blog or working with zoho, diigo, or other services. I see that there are work days scheduled and days for "logistics;" maybe that type of work is included here.
Overall, great job!
As mentioned above, there is a lot of technology skills that students may be learning and not be quite comfortable with yet... other than that, everything looks great!