Spent some time last night checking out Stamped - a new iOS app that falls into the general category of "Rank Everything." Fortunately, it keeps it simple in its execution - no star ratings or fluctuating levels of approval. If you Stamp It, you Approve It. Your incoming suggestions are from users you specifically follow, not just an aggregate of the general user base - so, in theory, the suggestions are from trusted sources and actually worth checking out. The intro video explains it well. Go watch that and then decide if you want to try it out.