In short, the answer is yes, you can report a blog. However, there are some caveats that need to be taken into account. First and foremost, it is important to understand that reporting a blog does not automatically mean that the blog will be taken down. In fact, it is quite possible that the blog owner may simply choose to take down the blog in response to being reported.
Secondly, it is important to remember that reporting a blog does not constitute an endorsement by Google of the content found on the blog. Rather, it is simply an effort on our part to provide a mechanism for members of the community to report problematic content. Finally, please be aware that reporting a blog does not automatically mean that Google will take any action in response to the report.