What they have depends on who is pinning. I see a ton of pins that ARE only pictures and when you click on them, they just go to a picture. That is annoying when it's something like a recipe and they pinned or repinned from an image. I've also seen pins that go to the homepage of a site or blog and then it's nearly impossible to find the actual article that was pinned. I think a lot of people don't understand proper pinning and a lot of people repin without checking the link first. I have a lot of tutorials on my boards. Other than my "ideas only, no tutes" board I only pin actual tutorials or patterns.
http://www.pinterest.com/galegale