I am glad to see this question, and the clarification of Pinterest. I had not understood it as just an assortment of links.
I did know, and have explained to, literally hundreds of college students, that anything put on line is visible in ways you do not expect.
I work with architects and architecture students, and the issue of design, and images being visible without source or credit is an ever evolving problem. One solution is to insert your name into the image before uploading. (When speaking to the students I also mention that posting while drinking leads to an internet presence you might regret. Probably not relevant here.
)