The 3rd party JS functionality is not limited to tools. There is a lot more than can be embedded into your stores, through the same feature.
1. Badges: Do you support an NGO, a social campaign or any other initiative that you are proud of? Put up a badge of the same on your online store and spread the awareness.
2. Verifications: Verify your Pinterest account by uploading the Pinterest verification code onto your website. A red check mark will appear on your Pinterest photos indicating that you indeed own the website, which lends to your credibility.