Whatever the precise percentages, the vast majority of readers thought philosophy blogs have had some effect on the profession, most thinking that effect either somewhat positive or somewhat negative, but with others going further in both directions. For purposes of discussion, let's distinguish between what I will call Substantive Blogs like Certain Doubts and PeaSoup, which are primarily devoted to discussing substantive questions in particular areas of philosophy (e.g., epistemology or ethics) and Professional Blogs, which deal with various issues in the profession (as well as news of the profession), like this blog or Feminist Philosophers. Some others do a bit of both. (For amusement, I remind readers of this poll from just three years ago. NewApps, alas, imploded in the interim.)
So in explaining how or why you think philosophy blogs have had positive or negative effects on the profession, please make clear whether you are referencing Substantive Blogs or Professional Blogs, or both. I would prefer signed comments, but if you do not sign your name, please use a distinct moniker and you must include a valid e-mail address (I do sometimes e-mail to suggest how a comment might be made more constructive). Keep the discussion substantive, please, no bald declarations of praise or blame for this blog or any other.