I generally see Pinterest as a place to find references as examples of differant kinds of images. Some people might use Pinterest as a place to study and analyse thumbnails for research, and Pinterest images CAN directly link you to the video it'self so I think it would be a worthwhile persuit. I've used Pinterest to look for business card design and drawing references, and in turn, those images have led me to some great blogs and other reference sites, so it would be a fantastic way to get more opportunities for eyes on you work. Give it a go.