Building a specialized blog

Building a specialized blog as medical or sports blog is for sure better than a general one, find what kind of stuff you are interested and have good knowledge about, try to find what kind of talk your friends like to hear you talking about, this is the most probable talk will make your blog famous online.
I say this because I find a lot and a lot of duplicated blogs, not just copy and past, the whole idea.
You are likely to be a unique webmaster writing about "care of diabetic foot" or how to raise ponies",

Try to deal with your visitors as your friends.