You should try to think about who wants/needs the service you want to promote and how they might seek to evaluate their choices. Pinterest would be far (very far) down the list of places for services simply because it is a platform for sharing images of things. Pictures of products can help retailers, but unless you have a national or international brand or consumer products no one is looking for your Pinterest page.

I also want to know some techniques to be used for B2B promotions through pinterest. Can anybody post some genuine and useful ones pls