"Great, a couple of transistors and resistors, an 8-pin IC - that looks about right. Let's just see how it works, and...oh. Nope, it's just that image, with no part numbers. And nothing else."
I can only guess that some people use it as a half-assed whiteboard to remember links and stuff, and Google picks up on that. The ironic problem for Google is, the 'pin' replaces the actual useful content which the Pinterest users were originally hoping to remember for later access!
"Great, a couple of transistors and resistors, an 8-pin IC - that looks about right. Let's just see how it works, and...oh. Nope, it's just that image, with no part numbers. And nothing else."
I can only guess that some people use it as a half-assed whiteboard to remember links and stuff, and Google picks up on that. The ironic problem for Google is, the 'pin' replaces the actual useful content which the Pinterest users were originally hoping to remember for later access!