First a little disclaimer, I am not an expert in social bookmarking. I've used a couple, maybe a dozen of services, and slowly gathered experience. Now when I leveled to level 2 so to say, I feel I can write something on the matter. What made me write this post is a recent "discovery". Not all social media sites are the same and not all "like" the same content. While this seems like a pretty obvious finding, it did not look like that to me at the beginning.