I love Pinterest! I have more than 260 boards. Pinterest is merely a place to hold links to other sites. If you aren't getting the info you want when you go to a site, it isn't Pinterest's fault, it's the site's problem. Some sites just aren't any good. Some sites make you go through hoops to get the info you are looking for. As someone else said, you can make any or all of your boards private. And if someone follows you or pins something of yours and you don't want them to do that, you can block them. I am not on Face Book, but I spend a lot of time on Pinterest!
Leslie