Hi I have a private blog of 72 websites. In each private blog, more than 100 blog posts made. In maximum blogs i have given backlinks to web 2.0 properties. As you know some web 2.0 properties deleted after some days or months. So i want to replace those backlink with new websites. So how i will verify as per posts, which backlink is dead and which is alive? any software to do so? or any method?