Yes, Pinterest has turned out to be one of the most powerful social networking websites on Internet. Although it is completely different than most of the social networks like Facebook and Twitter, people have gracefully accepted it.
Online marketers have found a great marketing weapon in Pinterest. But when it comes to Private sharing, Pinterest proves to be a lousy service. I have posted a good infographic which lists some good private board alternatives to Pinteraest.
These Pinterest like services serves well if you are looking for a private posting web service.
Best Private Board Alternatives To Pinterest – Infographic