I would like to add friends on facebook who has attract about blogging. So how can I find friends with any specific niche attract?
Huh? Use the search bar and search for specific niches. Go to those pages and see who is following them. Then send a friend request. It's going to be hard to get them to say yes to a stranger though. You are better off starting a page on said topic and get friends by offering solid content and engagement. Might be easier.
enter your occupation as blogger, and when you go to the suggested friends link select the option of people from your own industry, check mark blogger in it, and so you will find them
It seems that facebook has read your mind in some way or another. For what you are trying to do, the Graph Search will be perfect. Just sign in for the waiting list, and when you'll have the Graph search, just type 'friends who are bloggers' or 'friends who like blogging' and then magic will happen.
You could also join some groups on Facebook related to blogging, contribute, and interact with some of the bloggers in the group. After a little while, you should be able to gain some blogger friends. You can also do this for pages related to blogging.
Using the Search function will get you just about everything you need. You can find people with similar interests, as well as Facebook groups, Fan Pages, events, polls etc. And once you've found a handful of those, search through what they have liked, and friended and all that. If you were to spend a couple hours searching for your specific niche, and then in the likes and friends of every page you find from your search, you would definitely have several hundred pages to go through.