I answered: "I don't (n°1)".
Well, I am going to provide more details here because I can't really say that I don't find all blogs useful or interesting, actually it depends!
If it's the blog of an author that I admire, of course I will find his/her articles useful and interesting!
But in general I am not a fan of the format of Blogs. There are some exceptions but most of the times I don't read them, I prefer Forum because we aren't "passive" there. It's just a personal preference concerning format and communication!
And there is as well the time, I have to limit myself online!