The selfie is quite a new phenomenon and the list is being added to even as we speak, so any 'top selfie' list is going to go out of date very quickly. However, the selfie has become so popular that there is now a kind of competition known as the Selfie Olympics. For this, people produce really elaborate pictures, very far away from the typical selfie which is spontaneous and often taken when the person isn't even sober.
In the more competitive selfie, the people in the picture often arrange themselves into strange or uncomfortable poses. They may try to get inside a small area or balance on top of something. Others try to make the picture into more of a composition, with as many objects as possible collected around them.
You can get a good idea of what are considered the best selfies by looking at this Olympic top 10.