If you have not got a Pinterest account yet you can easily set one up at pinterest.com. If you want to change your Pinterest personal account go to business.pinterest.com and click on the convert button and choose your niche.
Have you heard of the thing where people follow you hoping you'll follow them back but when you do they unfollow you? Is there some benefit in having more people following you than followers?
You can find out on status brew who isn't following you on Instagram and Twitter and then unfollow them. I don't think you can find out on WA - maybe some other members know if it's possible without having to go through all your followers and those you follow.