Pin Etiquette(Original Post :  https://pinterest.com/about/etiquette/ )
Pinterest is special because of the people who use it.The guidelines below are based on collective input from people using Pinterest. These are suggestions to help keep our community positive and to ensure that every pin is useful to other people.

Be NicePinterest is a community of people. We know that tastes are personal, but be respectful in your comments and conversations.

Credit Your SourcesPins are the most useful when they have links back to the original source. If you notice that a pin is not sourced correctly, leave a comment so the original pinner can update the source. Finding the original source is always preferable to a secondary source such as Google Image Search or a blog entry.

Avoid Self PromotionPinterest is designed to curate and share things you love. If there is a photo or project you’re proud of, pin away! However, try not to use Pinterest purely as a tool for self-promotion.

Report Objectionable ContentWe do not allow nudity or hateful content. If you find content that is objectionable or violates our Terms of Service can submit the content for review by pushing the “Report Content” link.

Tell Us How to Make Pinterest BetterWe're just getting started, so there are going to be bumps here and there. Let us know what's working, what's not. We take your input seriously. You can get in touch with us anytime:

• Suggestions: hi@pinterest.com
• Bugs: bugs@pinterest.com
• Help: help@pinterest.com